APA (7th ed.) Citation

Worrall, J. (1969). Introduction to valence theory. American Elsevier Pub. Co.

Chicago Style (17th ed.) Citation

Worrall, Jean. Introduction to Valence Theory. New York: American Elsevier Pub. Co, 1969.

MLA (9th ed.) Citation

Worrall, Jean. Introduction to Valence Theory. American Elsevier Pub. Co, 1969.

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