APA (7th ed.) Citation

Berkey, R. L., & Alberts, M. (1985). Comma sense: 4x4 punctuation tutorial for MS-DOS (IBM) Computers. [publisher not identified].

Chicago Style (17th ed.) Citation

Berkey, Richard L., and Mark Alberts. Comma Sense: 4x4 Punctuation Tutorial for MS-DOS (IBM) Computers. [Grand Junction, Colo.]: [publisher not identified], 1985.

MLA (8th ed.) Citation

Berkey, Richard L., and Mark Alberts. Comma Sense: 4x4 Punctuation Tutorial for MS-DOS (IBM) Computers. [publisher not identified], 1985.