Citazione Stile APA (7a Edizione)

Obra, B. Q., Villanueva, A. F. R., & Miranda, F. E. (1982). Mineral resources in the coastal area of Region I. Bureau of Mines and Geo-Sciences.

Citazione stile Chigago Style (17a edizione)

Obra, Benjamin Q., Abner Fe R. Villanueva, e Federico E. Miranda. Mineral Resources in the Coastal Area of Region I. Baguio City: Bureau of Mines and Geo-Sciences, 1982.

Citatione MLA (9a ed.)

Obra, Benjamin Q., et al. Mineral Resources in the Coastal Area of Region I. Bureau of Mines and Geo-Sciences, 1982.