Cita APA (7th ed.)

Bettger, F. (1954). How I multiplied my income and happiness in selling. Prentice-Hall.

Cita Chicago (17th ed.)

Bettger, Frank. How I Multiplied My Income and Happiness in Selling. New York: Prentice-Hall, 1954.

Cita MLA (9th ed.)

Bettger, Frank. How I Multiplied My Income and Happiness in Selling. Prentice-Hall, 1954.