Cita APA (7a ed.)

Spurr, J. E., & Emmons, S. F. 1. -. 1. (1898). Atlas to Accompany Monograph XXXI on the Geology of the Aspen District Colorado. United States Geological Survey.

Cita Chicago Style (17a ed.)

Spurr, Josiah Edward, y Samuel Franklin 1841 - 1911 Emmons. Atlas to Accompany Monograph XXXI on the Geology of the Aspen District Colorado. Washignton DC: United States Geological Survey, 1898.

Cita MLA (9a ed.)

Spurr, Josiah Edward, y Samuel Franklin 1841 - 1911 Emmons. Atlas to Accompany Monograph XXXI on the Geology of the Aspen District Colorado. United States Geological Survey, 1898.