APA (7th ed.) Citation

Delderfield, R. F. (1971). Theirs was the kingdom. Simon and Schuster.

Chicago Style (17th ed.) Citation

Delderfield, R. F. Theirs Was the Kingdom. New York: Simon and Schuster, 1971.

MLA (9th ed.) Citation

Delderfield, R. F. Theirs Was the Kingdom. Simon and Schuster, 1971.