APA (7th ed.) Citation

Van Essen, W. (1969). The spectrum of pain. Hart-Davis.

Chicago Style (17th ed.) Citation

Van Essen, William. The Spectrum of Pain. London: Hart-Davis, 1969.

MLA (8th ed.) Citation

Van Essen, William. The Spectrum of Pain. Hart-Davis, 1969.

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