APA (7th ed.) Citation

Godfrey, D., & Parkhill, D. F. (1982). Gutenberg two (3rd ed.). Porcépic.

Chicago Style (17th ed.) Citation

Godfrey, David, and D. F. Parkhill. Gutenberg Two. 3rd ed. Toronto [etc.]: Porcépic, 1982.

MLA (9th ed.) Citation

Godfrey, David, and D. F. Parkhill. Gutenberg Two. 3rd ed. Porcépic, 1982.