Cita APA (7th ed.)
Hoyle, F., Wickramasinghe, C., & Friese, R. (1981). Evolution aus dem Weltraum: Evolution from space. Ullstein.
Cita Chicago (17th ed.)
Hoyle, Fred, Chandra Wickramasinghe, i Ralf Friese. Evolution Aus Dem Weltraum: Evolution from Space. Berlin, Frankfurt a.M., Wien: Ullstein, 1981.
Cita MLA (9th ed.)
Hoyle, Fred, et al. Evolution Aus Dem Weltraum: Evolution from Space. Ullstein, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.