Apil, F. W. (1983). Abstracts and summaries of geological investigations. Bureau of Mines and Geo-Sciences.
Čikaški stil citiranja (17. izdanje)Apil, Fay Wangdali. Abstracts and Summaries of Geological Investigations. Baguio City: Bureau of Mines and Geo-Sciences, 1983.
MLA način citiranja (9. izdanje)Apil, Fay Wangdali. Abstracts and Summaries of Geological Investigations. Bureau of Mines and Geo-Sciences, 1983.
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