APA (7th ed.) Citation

Putney, M. J. (2019). Once a spy (First Kensington hardcover edition.). Kensington Books.

Chicago Style (17th ed.) Citation

Putney, Mary Jo. Once a Spy. First Kensington hardcover edition. New York, NY: Kensington Books, 2019.

MLA (8th ed.) Citation

Putney, Mary Jo. Once a Spy. First Kensington hardcover edition. Kensington Books, 2019.

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