Cita APA (7a ed.)

Proctor, T. (1997). Essentials of marketing research. Pitman.

Cita Chicago Style (17a ed.)

Proctor, Tony. Essentials of Marketing Research. London [etc.]: Pitman, 1997.

Cita MLA (9a ed.)

Proctor, Tony. Essentials of Marketing Research. Pitman, 1997.