APA (7e ed.) Bronvermelding

Williams, G. J., & Grantham, D. R. (1936). The geology and gold deposits of the Potaro: With petrological appendix. "The Argosy" co..

Chicago (17e ed.) Bronvermelding

Williams, Gordon John, en Donald Robert Grantham. The Geology and Gold Deposits of the Potaro: With Petrological Appendix. Georgetown, Demerara: "The Argosy" co., 1936.

MLA (8e ed.) Bronvermelding

Williams, Gordon John, en Donald Robert Grantham. The Geology and Gold Deposits of the Potaro: With Petrological Appendix. "The Argosy" co., 1936.