Cita APA (7th ed.)

Erickson, F. J., & Vonk, J. A. (1996). Effective word 7.0. Irwin.

Cita Chicago (17th ed.)

Erickson, Fritz J., i John A. Vonk. Effective Word 7.0. Chicago: Irwin, 1996.

Cita MLA (9th ed.)

Erickson, Fritz J., i John A. Vonk. Effective Word 7.0. Irwin, 1996.