Book #1: SONAR POWER! by Scott R. Garrigus, technically edited by Cakewalk. 2001, 470 pages.
From the description on the back of the book: "SONAR Power! is the ultimate guide to getting the most out of your software. Expert Scott R. Garrigus uses step-by-step instructions, detailed explanations, and useful tips and techniques to get you producing the results you want.

Book #2 (w/ CD-ROM): Wizoo Cakewalk SONAR QuickStart Book w/Supplement CD-ROM by Craig Anderton
2001, 49 pages. Includes "CD-ROM with with fully-functional Sonar trial version, video tutorials, learn-by-doing examples, free drum loops, and a new Craig Anderton song produced in Sonar"