Cita APA (7a ed.)

Bova, B. (1990). First contact: The search for extraterrestrial intelligence. Penguin Books.

Cita Chicago Style (17a ed.)

Bova, Ben. First Contact: The Search for Extraterrestrial Intelligence. New York: Penguin Books, 1990.

Cita MLA (9a ed.)

Bova, Ben. First Contact: The Search for Extraterrestrial Intelligence. Penguin Books, 1990.