This book was produced by Compute! magazine editors in 1981, with parts of it appearing in issues of the magazine in 1980.  It provides a starting guide to the Commodore PET and Commodore CBM computers.  The book could work as a step-by-step guide, but many of the articles stand alone, having been gathered from various editions of the magazine.

Publisher: Compute! Books
Author: The Editors of COMPUTE! Magazine

Publisher: Sigma Press
Author: E.A. Flinn, A.E. Hill, R.D. Tomlinson

This book contains instructions relating to the subroutines of the Commodore PET.

From the Introduction:

'For the average PET user the prospect of writing a set of programs to perform, say, a business application is daunting.  Many don't even try, preferring to employ someone to do the job or buy an off-the-shelf package...These problems are purely a mental block, since any person of average intelligence can write and design such a program.  Given a logical framework on which to build, plus a few aids in the form of standard subroutines, the process of writing an applications program becomes considerably easier.'

First edition, June 1980.

Publisher: Computabits
Author: Nick Hampshire

This book contains instructions relating to the production of graphics on the Commodore PET.

From the Foreword:

'This book has two objectives.  One, to provide the reader with an introduction to the programming techniques used to generate graphic displays.  Two, to provide the programmer with a complete package of machine code routines giving a wide range of normally unavailable graphics functions.'

First edition, April 1981.

Publisher: Computabits
Author: Nick Hampshire