Cita APA (7a ed.)

Zelikoff, M. (1957). The Ehreshold of Space. Pergamon Press.

Cita Chicago Style (17a ed.)

Zelikoff, M. The Ehreshold of Space. London: Pergamon Press, 1957.

Cita MLA (9a ed.)

Zelikoff, M. The Ehreshold of Space. Pergamon Press, 1957.