APA (7th ed.) Citation

Mathews, A. E. (1868). Pencil sketches of Montana. [publisher not identified].

Chicago Style (17th ed.) Citation

Mathews, Alfred E. Pencil Sketches of Montana. New York: [publisher not identified], 1868.

MLA (9th ed.) Citation

Mathews, Alfred E. Pencil Sketches of Montana. [publisher not identified], 1868.