Heilborn, John Commodore 64 Guía del usuario / John Heilborn - Mexico : McGraw-Hill - 446p. / 23 cm. ISBN: 968-451-760-2 Subjects--Topical Terms: 1. COMMODORE 64 LC Class. No.: QA76.8 C6 H4 Dewey Class. No.: 001.644 H757c