Gaya APA

, ., Oppenheim, A. ([s.a]). Questionnaire design and attitude measurement . [s.l]: [s.l]: [s.n]; [s.l].

Gaya MLA

, ., Oppenheim, A.N.. "Questionnaire design and attitude measurement". [s.l]: [s.l]: [s.n]; [s.l], [s.a]. Text.