Cita APA (7th ed.)

Dumoulin, J. A., & Gray, J. E. (1997). Geologic studies in Alaska by the U.S. geological survey, 1995. U.S. G.P.O.

Cita Chicago (17th ed.)

Dumoulin, Julie A., i John E. Gray. Geologic Studies in Alaska by the U.S. Geological Survey, 1995. Washington: U.S. G.P.O, 1997.

Cita MLA (9th ed.)

Dumoulin, Julie A., i John E. Gray. Geologic Studies in Alaska by the U.S. Geological Survey, 1995. U.S. G.P.O, 1997.