Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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