(2001). Geology, geochemistry, geophysics, mineral occurrences, and mineral resource assessment for the commonwealth of Puerto Rico editor, Walter J. Bawiec ; in cooperation with Puerto Rico Department of Natural Resources, University of Puerto Rico at Mayagüez. [electronic resource].
Chicago-viite (17. p.)Geology, Geochemistry, Geophysics, Mineral Occurrences, and Mineral Resource Assessment for the Commonwealth of Puerto Rico Editor, Walter J. Bawiec ; in Cooperation with Puerto Rico Department of Natural Resources, University of Puerto Rico at Mayagüez. [electronic Resource]. 2001.
MLA-viite (9. p.)Geology, Geochemistry, Geophysics, Mineral Occurrences, and Mineral Resource Assessment for the Commonwealth of Puerto Rico Editor, Walter J. Bawiec ; in Cooperation with Puerto Rico Department of Natural Resources, University of Puerto Rico at Mayagüez. [electronic Resource]. 2001.