APA (7th ed.) Citation

Sundman, P. O. (1969). Two days, two nights ([1st American ed.].). Pantheon Books.

Chicago Style (17th ed.) Citation

Sundman, Per Olof. Two Days, Two Nights. [1st American ed.]. New York: Pantheon Books, 1969.

MLA (9th ed.) Citation

Sundman, Per Olof. Two Days, Two Nights. [1st American ed.]. Pantheon Books, 1969.