Cita APA (7th ed.)

Hower, A., & Hower, N. (1938). Successful letter writing: Business and personal (1a. ed.). Garden City Books.

Cita Chicago (17th ed.)

Hower, Aline, i Nels Hower. Successful Letter Writing: Business and Personal. 1a. ed. Nueva York: Garden City Books, 1938.

Cita MLA (9th ed.)

Hower, Aline, i Nels Hower. Successful Letter Writing: Business and Personal. 1a. ed. Garden City Books, 1938.