APA (7th ed.) Citation

Seth, R. (1965). Unmasked!: The story of Soviet espionage (First American edition.). Hawthorn Books, Inc.

Chicago Style (17th ed.) Citation

Seth, Ronald. Unmasked!: The Story of Soviet Espionage. First American edition. New York: Hawthorn Books, Inc, 1965.

MLA (9th ed.) Citation

Seth, Ronald. Unmasked!: The Story of Soviet Espionage. First American edition. Hawthorn Books, Inc, 1965.

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