Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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