Resources

The links below lead you to the API-related resources and references we have collected.

Notes

Comments
Unless otherwise noted (for example, in review comments) inclusion of a pointer to a resource does not indicate any recommendation or biased promotion of that resource.  This is just a place to find books and other materials to help you help your client or company better create and document APIs.
Amazon resources
FYI: Searching Amazon for "API" in Books returns over 3000 hits, of which only about 600 rate 4 stars or higher, and not all are relevant.   Most of these are aimed at developers.