APA-referens

Hobson, E. W. (1928). Treatise on plane and advanced trigonometry (7th ed.). Dover.

Chicago-stil citat

Hobson, E W. Treatise on Plane and Advanced Trigonometry. 7th ed. New York: Dover, 1928.

MLA-referens

Hobson, E W. Treatise on Plane and Advanced Trigonometry. 7th ed. Dover, 1928.