APA (7th ed.) Citation

Knudsen, H. F. (1967). I was Quisling's secretary. Britons Publishing Company.

Chicago Style (17th ed.) Citation

Knudsen, H. Franklin. I Was Quisling's Secretary. London: Britons Publishing Company, 1967.

MLA (8th ed.) Citation

Knudsen, H. Franklin. I Was Quisling's Secretary. Britons Publishing Company, 1967.