Cita APA (7th ed.)

Oskamp, S. (1991). Attitudes and opinions (2nd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Oskamp, Stuart. Attitudes and Opinions. 2nd ed. Englewood Cliffs, N.J: Prentice Hall, 1991.

Cita MLA (9th ed.)

Oskamp, Stuart. Attitudes and Opinions. 2nd ed. Prentice Hall, 1991.