Clapp, W. C. (1908). A vocabulary of the Igorot language as spoken by the Bontok Igorots. Igorot-English and English-Igorot. Bureau of Printing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClapp, Walter Clayton. A Vocabulary of the Igorot Language as Spoken by the Bontok Igorots. Igorot-English and English-Igorot. Manila: Bureau of Printing, 1908.
एमएलए (9वां संस्करण) प्रशस्ति पत्रClapp, Walter Clayton. A Vocabulary of the Igorot Language as Spoken by the Bontok Igorots. Igorot-English and English-Igorot. Bureau of Printing, 1908.
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