Cita APA (7th ed.)

Hobson, E. W. (1957). A treatise on plane and advanced trigonometry (7th ed.). Dover.

Cita Chicago (17th ed.)

Hobson, Ernest William. A Treatise on Plane and Advanced Trigonometry. 7th ed. New York: Dover, 1957.

Cita MLA (9th ed.)

Hobson, Ernest William. A Treatise on Plane and Advanced Trigonometry. 7th ed. Dover, 1957.