---
title: "Reference"
description: "Reference"
url: "https://www.contentstack.com/docs/developers/sdks/content-delivery-sdk/swift/reference/reference"
product: "Contentstack"
doc_type: "guide"
audience:
  - developers
  - admins
version: "current"
last_updated: "2026-09-13"
---

# Reference

## Reference

When fetching entries, you can search base on reference \`$in\` or \`$nin\`.

[Reference Search Equals](https://www.contentstack.com/docs/developers/apis/content-delivery-api/#reference-search-equals).

[Reference Search Not-equals](https://www.contentstack.com/docs/developers/apis/content-delivery-api/#reference-search-not-equals).

## Reference | Swift Delivery SDK | Contentstack

Reference lets you search entries based on referenced fields using $in or $nin operators in the Swift Delivery SDK.