Cita APA (7a ed.)

Harris, G., & Harris, G. J. (1991). Talk is cheap: Promoting your business through word of mouth advertising (1st edition.). Americas Group.

Cita Chicago Style (17a ed.)

Harris, Godfrey, y Gregrey J. Harris. Talk Is Cheap: Promoting Your Business Through Word of Mouth Advertising. 1st edition. Los Angeles (California), USA: Americas Group, 1991.

Cita MLA (9a ed.)

Harris, Godfrey, y Gregrey J. Harris. Talk Is Cheap: Promoting Your Business Through Word of Mouth Advertising. 1st edition. Americas Group, 1991.