De Guzman, G. G. (1977). The use of alphabeticall listed frame in stratified sampling design [microform]. Photoduplication Service. University of the Philippines Library.
Παραπομπή σε μορφή Chicago (17η εκδ.)De Guzman, Generoso G. The Use of Alphabeticall Listed Frame in Stratified Sampling Design [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
Παραπομπή σε μορφή MLA (9th εκδ.)De Guzman, Generoso G. The Use of Alphabeticall Listed Frame in Stratified Sampling Design [microform]. Photoduplication Service. University of the Philippines Library, 1977.
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