APA

Wynn J. C., Sidder G. B. & United States Geological Survey. (1991). Mineral resource potential of the NB-20-4 Quadrangle, Eastern Guayana Shield, Bolívar State, Venezuela. [Washington, DC]: United States Gov. Print. Office.

Chicago

Wynn Jeffrey C, Sidder Gary B and United States Geological Survey. 1991. Mineral resource potential of the NB-20-4 Quadrangle, Eastern Guayana Shield, Bolívar State, Venezuela. [Washington, DC]: United States Gov. Print. Office.

Harvard

Wynn J. C., Sidder G. B. and United States Geological Survey. (1991). Mineral resource potential of the NB-20-4 Quadrangle, Eastern Guayana Shield, Bolívar State, Venezuela. [Washington, DC]: United States Gov. Print. Office.

MLA

Wynn Jeffrey C, Sidder Gary B and United States Geological Survey. Mineral resource potential of the NB-20-4 Quadrangle, Eastern Guayana Shield, Bolívar State, Venezuela. [Washington, DC]: United States Gov. Print. Office. 1991.