APA (7e ed.) Bronvermelding

Torres, L. A. (1977). Human ecology and informal groups [microform]. Photoduplication Service. University of the Philippines Library.

Chicago (17e ed.) Bronvermelding

Torres, Lilia Arbues. Human Ecology and Informal Groups [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.

MLA (9e ed.) Bronvermelding

Torres, Lilia Arbues. Human Ecology and Informal Groups [microform]. Photoduplication Service. University of the Philippines Library, 1977.