Παραπομπή APA

Shapiro, R. (1999). Planetary dreams: The quest to discover life beyond earth. John Wiley.

Παραπομπή Chicago Style

Shapiro, Robert. Planetary Dreams: The Quest to Discover Life Beyond Earth. New York: John Wiley, 1999.

Παραπομπή MLA

Shapiro, Robert. Planetary Dreams: The Quest to Discover Life Beyond Earth. John Wiley, 1999.