APA (7th ed.) Citation

Leopold, N. F. (1960). Life + 99 years. Four Square Books.

Chicago Style (17th ed.) Citation

Leopold, Nathan Freudenthal. Life + 99 Years. London: Four Square Books, 1960.

MLA (9th ed.) Citation

Leopold, Nathan Freudenthal. Life + 99 Years. Four Square Books, 1960.

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