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.