7th edition (covers ASE 15.x & 16.0 SP03):
Written by Rob Verschoor, Certified DBA for SAP ASE, SAP Replication Server and SAP IQ.
A unique Guide for ASE,
This book is the only real ASE Quick Reference Guide that's available. It contains all commands, functions, procedures and other information you might need when working with ASE. It includes full command syntax, command descriptions and examples, as well as a selection of useful undocumented commands.
There's also a handy 21-page index that is designed to help you quickly find the topic you're looking for.
It's probably the most useful book any ASE DBA or developer could want to have, and it got some good reviews.
New Membership Benefit - Receive a free issue of 7th Edition ASE Handbook as a paid member.