Pili, I. B. (1977). A survey of completed descriptive and contrastive researches on teaching English as a second language from 1959 to 1971 [microform]. Photoduplication Service.University of the Philippines Library.
Čikaški stil citiranja (17. izdanje)Pili, Irene B. A Survey of Completed Descriptive and Contrastive Researches on Teaching English as a Second Language from 1959 to 1971 [microform]. Quezon City: Photoduplication Service.University of the Philippines Library, 1977.
MLA način citiranja (9. izdanje)Pili, Irene B. A Survey of Completed Descriptive and Contrastive Researches on Teaching English as a Second Language from 1959 to 1971 [microform]. Photoduplication Service.University of the Philippines Library, 1977.
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