Oppenheim, A. N. (1966). Questionnaire design and attitude measurement. Basic Books.
Cita Chicago (17th ed.)Oppenheim, Abraham Naftali. Questionnaire Design and Attitude Measurement. New York: Basic Books, 1966.
Cita MLA (9th ed.)Oppenheim, Abraham Naftali. Questionnaire Design and Attitude Measurement. Basic Books, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.