Cita APA (7a ed.)

Vakoch, D. A., & Harrison, A. A. (2011). Civilizations beyond earth: Extraterrestrial life and society. Berghahn Books.

Cita Chicago Style (17a ed.)

Vakoch, Douglas A., y Albert A. Harrison. Civilizations Beyond Earth: Extraterrestrial Life and Society. New York: Berghahn Books, 2011.

Cita MLA (8a ed.)

Vakoch, Douglas A., y Albert A. Harrison. Civilizations Beyond Earth: Extraterrestrial Life and Society. Berghahn Books, 2011.