Cita APA (7a ed.)

Spurr J. E. Josian Edward & Emmons S. F. Samuel Franklin. (1898). Geology of the Aspen mining district, Colorado, wiht atlas. Washington, Governmext Printing Office, 1898.

Cita Chicago Style (17a ed.)

Spurr J. E. Josian Edward y Emmons S. F. Samuel Franklin. Geology of the Aspen Mining District, Colorado, Wiht Atlas. Washington, Governmext Printing Office, 1898, 1898.

Cita MLA (9a ed.)

Spurr J. E. Josian Edward y Emmons S. F. Samuel Franklin. Geology of the Aspen Mining District, Colorado, Wiht Atlas. Washington, Governmext Printing Office, 1898, 1898.