Cita APA (7th ed.)

Welch, S., & Comer, J. (1975). Public opinion: Its formation, measurement, and impact. Mayfield.

Cita Chicago (17th ed.)

Welch, Susan, i John Comer. Public Opinion: Its Formation, Measurement, and Impact. Palo Alto, Calif: Mayfield, 1975.

Cita MLA (9th ed.)

Welch, Susan, i John Comer. Public Opinion: Its Formation, Measurement, and Impact. Mayfield, 1975.