APA (7e ed.) Bronvermelding

Tangco, M. A. D. (1979). The effects of frustration on the flexibility of internals and externals [microform]. Photoduplication Service. University of the Philippines Library.

Chicago (17e ed.) Bronvermelding

Tangco, Maria Angelita Dineros. The Effects of Frustration on the Flexibility of Internals and Externals [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1979.

MLA (9e ed.) Bronvermelding

Tangco, Maria Angelita Dineros. The Effects of Frustration on the Flexibility of Internals and Externals [microform]. Photoduplication Service. University of the Philippines Library, 1979.