The Machine Language Book of the Commodore 64 - By Lothar Englisch - PaperBack

Compute's Machine Language Routines for the Commodore 64

Assembly Language Programming With The Commodore 64 By Marvin L. De Jong - COIL

Machine Language for the Commodore 64, 128, and Other Commodore Computers - SB

Introducing Commodore 64 Machine Code BY Ian Sinclair - Coil Bound

Commodore 64 Machine Code Master - C64 Book

Creating Arcade Games on the Commodore 64 By Robert Camp - Coil Bound Edition

Commodore 64/128 Assembly Language Programming - 6x9 Coil Bound Edition