APA (7e ed.) Bronvermelding

Apil, F. W., Miranda, F. E., & Villanueva, A. F. R. (1983). Abstracts and summaries of geological investigations. Bureau of Mines and Geo-sciences.

Chicago (17e ed.) Bronvermelding

Apil, Fay Wangdali, Federico E. Miranda, en Abner Fe R. Villanueva. Abstracts and Summaries of Geological Investigations. Baguio City, Philippines: Bureau of Mines and Geo-sciences, 1983.

MLA (9e ed.) Bronvermelding

Apil, Fay Wangdali, et al. Abstracts and Summaries of Geological Investigations. Bureau of Mines and Geo-sciences, 1983.