Mencias, C. F. (1991). Designing questionnaires. Learning Resources Unit, National Teacher Training Center for the Health Professions, University of the Philippines Manila.
Chicago-referens (17:e uppl.)Mencias, Cristina F. Designing Questionnaires. Manila: Learning Resources Unit, National Teacher Training Center for the Health Professions, University of the Philippines Manila, 1991.
MLA-referens (9:e uppl.)Mencias, Cristina F. Designing Questionnaires. Learning Resources Unit, National Teacher Training Center for the Health Professions, University of the Philippines Manila, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.