APA (7th ed.) Citation

Moen, P., & Koefoed, B. (1951). Peter Moen's diary. Creative Age Press.

Chicago Style (17th ed.) Citation

Moen, Petter, and Bjorn Koefoed. Peter Moen's Diary. New York: Creative Age Press, 1951.

MLA (9th ed.) Citation

Moen, Petter, and Bjorn Koefoed. Peter Moen's Diary. Creative Age Press, 1951.