APA (7th ed.) Citation

Greatorex, E., & Greenwood, G. (1873). Summer etchings in Colorado. G. P. Putnam's sons.

Chicago Style (17th ed.) Citation

Greatorex, Eliza, and Grace Greenwood. Summer Etchings in Colorado. New York: G. P. Putnam's sons, 1873.

MLA (9th ed.) Citation

Greatorex, Eliza, and Grace Greenwood. Summer Etchings in Colorado. G. P. Putnam's sons, 1873.