Cita APA

Williams, B., & Epstein, S. (1958). The rocket pioneers on the road to space. New York: Julian Messner.

Chicago Style Citation

Williams, Beryl., i Samuel Epstein. The Rocket Pioneers On the Road to Space. New York: Julian Messner, 1958.

Cita MLA

Williams, Beryl., i Samuel Epstein. The Rocket Pioneers On the Road to Space. New York: Julian Messner, 1958.

Atenció: Aquestes cites poden no estar 100% correctes.