APA (7th ed.) Citation

Leighton, H. (1947). Guidebook to the geology about Pittsburgh (2d ed.). [publisher not identified].

Chicago Style (17th ed.) Citation

Leighton, Henry. Guidebook to the Geology About Pittsburgh. 2d ed. Harrisburg: [publisher not identified], 1947.

MLA (9th ed.) Citation

Leighton, Henry. Guidebook to the Geology About Pittsburgh. 2d ed. [publisher not identified], 1947.