Clapp, W. C. (1977). A vocabulary of the Igorot as spoken by the Bontok Igorots. Igorot-English and Eglish-Igorot [microform]. Photoduplication Service.
Citazione stile Chigago Style (17a edizione)Clapp, Walter Clayton. A Vocabulary of the Igorot as Spoken by the Bontok Igorots. Igorot-English and Eglish-Igorot [microform]. Quezon City: Photoduplication Service, 1977.
Citatione MLA (9a ed.)Clapp, Walter Clayton. A Vocabulary of the Igorot as Spoken by the Bontok Igorots. Igorot-English and Eglish-Igorot [microform]. Photoduplication Service, 1977.
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