Cita APA (7th ed.)

Modell, W. (1961). Relief of symptoms (2nd ed.). Mosby.

Cita Chicago (17th ed.)

Modell, Walter. Relief of Symptoms. 2nd ed. St. Louis: Mosby, 1961.

Cita MLA (8th ed.)

Modell, Walter. Relief of Symptoms. 2nd ed. Mosby, 1961.