Cita APA (7a ed.)

Dunbar, C. O., & Condra, G. E. (1932). Brachiopoda of the Pennsylvanian system in Nebraska. State of Nebraska.

Cita Chicago Style (17a ed.)

Dunbar, Carl Owen, y George Evert Condra. Brachiopoda of the Pennsylvanian System in Nebraska. Lincoln: State of Nebraska, 1932.

Cita MLA (8a ed.)

Dunbar, Carl Owen, y George Evert Condra. Brachiopoda of the Pennsylvanian System in Nebraska. State of Nebraska, 1932.