APA (7th ed.) Citation

Godfrey, D., & Parkhill, D. F. (1979). Gutenberg two. Press Porcepic.

Chicago Style (17th ed.) Citation

Godfrey, Dave, and D. F. Parkhill. Gutenberg Two. Toronto: Press Porcepic, 1979.

MLA (9th ed.) Citation

Godfrey, Dave, and D. F. Parkhill. Gutenberg Two. Press Porcepic, 1979.