APA (7th ed.) Citation

Simms, E. (1966). Coloring of soap. American Perfumer., 81, 33.

Chicago Style (17th ed.) Citation

Simms, E. "Coloring of Soap." American Perfumer. 81 (1966): 33.

MLA (9th ed.) Citation

Simms, E. "Coloring of Soap." American Perfumer., vol. 81, 1966, p. 33.