Cita APA (7a ed.)

Smith, W. D., & Packard, E. L. (1919). The salient features of the geology of Oregon. University of Oregon.

Cita Chicago Style (17a ed.)

Smith, Warren D., y Earl L. Packard. The Salient Features of the Geology of Oregon. [Eugene?: University of Oregon, 1919.

Cita MLA (8a ed.)

Smith, Warren D., y Earl L. Packard. The Salient Features of the Geology of Oregon. University of Oregon, 1919.

Precaución: Estas citas no son 100% exactas.