---
schema_version: "1"
id: 6c69da3aa3b12b20ba7e5d93490c46d54a61e8bd5e0d386fe54e7eefc76642ef
title: Resources—External
collection: legacydeveloper
version: current
locale: en-us
portal_url: https://docs.salesforce.com/legacydeveloper/current/en-us/integration_patterns_and_practices/integ_pat_resources_external.md
canonical_url: https://developer.salesforce.com/docs/atlas.en-us.integration_patterns_and_practices.meta/integration_patterns_and_practices/integ_pat_resources_external.htm
source_site: developer.salesforce.com
content_type: documentation
content_hash: 9e7d82e223b749ebc1b5dc454995b1be9eca787360e171c169f524cadbf55906
---
# Resources—External

1. Hohpe, Gregor, and Bobby Woolf. [Enterprise Integration Patterns](http://www.amazon.com/Enterprise-Integration-Patterns-Designing-Deploying/dp/0321200683/ref=sr_1_1?s=books&ie=UTF8&qid=1337717676&sr=1-1 "HTML (New Window)"). Boston: Addison-Wesley Professional, 2003.
2. Microsoft Corporation. [Integration Patterns (Patterns & Practices)](http://www.amazon.com/Integration-Patterns-Practices-Microsoft-Corporation/dp/073561850X/ref=sr_1_2?s=books&ie=UTF8&qid=1337717848&sr=1-2 "HTML (New Window)"). Redmond: Microsoft Press, 2004.
3. “Synchronous vs. Asynchronous Communication in Applications Integration,” MuleSoft, last accessed March 18, 2019, [https://www.mulesoft.com/resources/esb/applications-integration](https://www.mulesoft.com/resources/esb/applications-integration "HTML (New Window)").
4. “Hub and Spoke \[or\] Zen and the Art of Message Broker Maintenance,” Enterprise Integration Patterns, last accessed March 18, 2019, [http://www.eaipatterns.com/ramblings/03\_hubandspoke.html](http://www.eaipatterns.com/ramblings/03_hubandspoke.html "HTML (New Window)").