Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.