Gaya APA

E, S., Gallhofer, I, N. (2014). Design, Evaluation, and Analysis of Questionnaires for Survey Research;-SECOND EDITION . Canada: Wiley.

Gaya MLA

E, Saris,Willem., Gallhofer, Irmtraud, N.. "Design, Evaluation, and Analysis of Questionnaires for Survey Research;-SECOND EDITION". Canada: Wiley, 2014. Text.