APA (7th ed.) Citation

Cleator, P. E. (1961). An introduction to space travel. Pitman Pub. Corp..

Chicago Style (17th ed.) Citation

Cleator, P. E. An Introduction to Space Travel. New York: Pitman Pub. Corp., 1961.

MLA (9th ed.) Citation

Cleator, P. E. An Introduction to Space Travel. Pitman Pub. Corp., 1961.

Warning: These citations may not always be 100% accurate.