Howard, S., Stanley, P.(1981).Questions and answers in attitude surveys : experimens on question form, wording, and context / Howard Schuman, Stanley Presser .:.
Gaya MLA
Schuman, Howard., Presser, Stanley."Questions and answers in attitude surveys : experimens on question form, wording, and context / Howard Schuman, Stanley Presser".:,1981.Skripsi.