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 This document borrows heavily from:
 * [Designing HTTP Interfaces and RESTful Web Services](https://www.youtube.com/watch?v=zEyg0TnieLg)
-* [API Facade Pattern](http://apigee.com/about/resources/ebooks/api-fa%C3%A7ade-pattern), by Brian Mulloy, Apigee
-* [Web API Design](http://pages.apigee.com/web-api-design-ebook.html), by Brian Mulloy, Apigee
+* [API Facade Pattern](https://pages.apigee.com/rs/apigee/images/api-facade-pattern-ebook-2012-06.pdf), by Brian Mulloy, Apigee
+* [Web API Design](https://pages.apigee.com/rs/apigee/images/api-design-ebook-2012-03.pdf), by Brian Mulloy, Apigee
 * [Fielding's Dissertation on REST](http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm)
 
 ## Pragmatic REST