Παραπομπή σε μορφή APA (7η εκδ.)

Ward, P. D. (2005). Life as we do not know it: The NASA search for (and synthesis of) alien life. Viking.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ward, Peter D. Life as We Do Not Know It: The NASA Search for (and Synthesis of) Alien Life. New York: Viking, 2005.

Παραπομπή σε μορφή MLA (9th εκδ.)

Ward, Peter D. Life as We Do Not Know It: The NASA Search for (and Synthesis of) Alien Life. Viking, 2005.