Heilborn, John Your Commodore 64 : a guide to the Commodore 64 computer / - Berkeley, California : Osborne / McGraw-Hill, 1983 - xii, 444 p. : ill. ; 23 cm. Includes index ISBN: 0881341142 Subjects--Topical Terms: Commodore 64 (Computer)Commodore 64 (computer)--programming