APA-referens (7:e uppl.)

Hallgren, R. C. (1982). Interface projects for the Apple II. Prentice-Hall.

Chicago-referens (17:e uppl.)

Hallgren, Richard C. Interface Projects for the Apple II. Englewood Cliffs, N.J.: Prentice-Hall, 1982.

MLA-referens (8:e uppl.)

Hallgren, Richard C. Interface Projects for the Apple II. Prentice-Hall, 1982.