> ## Documentation Index
> Fetch the complete documentation index at: https://developers.openalex.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Sources Overview

> Schema reference for Sources entities

Sources are where works are hosted: journals, conferences, preprint repositories, and institutional repositories.

## Filter, sort, and group\_by fields

The API supports filtering, sorting, and grouping on sources fields. See [Filtering](/guides/filtering), [Sorting](/guides/sort), and [Grouping](/guides/grouping) for syntax.

Fields marked **(deprecated)** are `.search` filters — use the [`search` parameter](/guides/searching) instead.

### Top-level

| Field                        | Sort | Group\_by | Filter |
| ---------------------------- | :--: | :-------: | :----: |
| `apc_usd`                    |   ✓  |     ✓     |    ✓   |
| `cited_by_count`             |   ✓  |     ✓     |    ✓   |
| `continent`                  |   ✓  |     ✓     |    ✓   |
| `country_code`               |   ✓  |     ✓     |    ✓   |
| `display_name`               |   ✓  |           |    ✓   |
| `first_publication_year`     |   ✓  |           |    ✓   |
| `from_created_date`          |   ✓  |           |    ✓   |
| `has_issn`                   |   ✓  |     ✓     |    ✓   |
| `host_organization`          |   ✓  |     ✓     |    ✓   |
| `host_organization_lineage`  |   ✓  |     ✓     |    ✓   |
| `is_core`                    |   ✓  |     ✓     |    ✓   |
| `is_global_south`            |   ✓  |     ✓     |    ✓   |
| `is_high_oa_rate`            |   ✓  |     ✓     |    ✓   |
| `is_high_oa_rate_since_year` |   ✓  |           |    ✓   |
| `is_in_doaj`                 |   ✓  |     ✓     |    ✓   |
| `is_in_doaj_since_year`      |   ✓  |           |    ✓   |
| `is_in_jstage`               |      |     ✓     |    ✓   |
| `is_in_jstage_since_year`    |      |           |    ✓   |
| `is_oa`                      |   ✓  |     ✓     |    ✓   |
| `is_ojs`                     |   ✓  |     ✓     |    ✓   |
| `issn`                       |   ✓  |     ✓     |    ✓   |
| `issn_l`                     |   ✓  |     ✓     |    ✓   |
| `last_publication_year`      |   ✓  |           |    ✓   |
| `oa_flip_year`               |   ✓  |           |    ✓   |
| `openalex`                   |   ✓  |     ✓     |    ✓   |
| `openalex_id`                |      |     ✓     |    ✓   |
| `to_created_date`            |   ✓  |           |    ✓   |
| `to_updated_date`            |   ✓  |           |    ✓   |
| `type`                       |   ✓  |     ✓     |    ✓   |
| `works_count`                |   ✓  |     ✓     |    ✓   |

### Apc Prices

| Field                 | Sort | Group\_by | Filter |
| --------------------- | :--: | :-------: | :----: |
| `apc_prices.currency` |   ✓  |     ✓     |    ✓   |
| `apc_prices.price`    |   ✓  |           |    ✓   |

### Concept

| Field        | Sort | Group\_by | Filter |
| ------------ | :--: | :-------: | :----: |
| `concept.id` |   ✓  |     ✓     |    ✓   |

### Concepts

| Field         | Sort | Group\_by | Filter |
| ------------- | :--: | :-------: | :----: |
| `concepts.id` |   ✓  |     ✓     |    ✓   |

### Default

| Field                             | Sort | Group\_by | Filter |
| --------------------------------- | :--: | :-------: | :----: |
| `default.search` **(deprecated)** |      |           |    ✓   |

### Display Name

| Field                                  | Sort | Group\_by | Filter |
| -------------------------------------- | :--: | :-------: | :----: |
| `display_name.search` **(deprecated)** |      |           |    ✓   |

### Host Organization

| Field                  | Sort | Group\_by | Filter |
| ---------------------- | :--: | :-------: | :----: |
| `host_organization.id` |   ✓  |           |    ✓   |

### Ids

| Field          | Sort | Group\_by | Filter |
| -------------- | :--: | :-------: | :----: |
| `ids.mag`      |   ✓  |           |    ✓   |
| `ids.openalex` |   ✓  |     ✓     |    ✓   |

### Summary Stats

| Field                              | Sort | Group\_by | Filter |
| ---------------------------------- | :--: | :-------: | :----: |
| `summary_stats.2yr_mean_citedness` |   ✓  |     ✓     |    ✓   |
| `summary_stats.h_index`            |   ✓  |     ✓     |    ✓   |
| `summary_stats.i10_index`          |   ✓  |     ✓     |    ✓   |

### Topic Share

| Field            | Sort | Group\_by | Filter |
| ---------------- | :--: | :-------: | :----: |
| `topic_share.id` |   ✓  |     ✓     |    ✓   |

### Topics

| Field       | Sort | Group\_by | Filter |
| ----------- | :--: | :-------: | :----: |
| `topics.id` |      |           |    ✓   |

### X Concepts

| Field           | Sort | Group\_by | Filter |
| --------------- | :--: | :-------: | :----: |
| `x_concepts.id` |   ✓  |     ✓     |    ✓   |