Cita APA (7a ed.)

Billinger, R. D. (1939). Early Ironworks of Pennsylvania. The Durham Furnaces. Lehigh University.

Cita Chicago Style (17a ed.)

Billinger, Robert D. Early Ironworks of Pennsylvania. The Durham Furnaces. Pennsylvania: Lehigh University, 1939.

Cita MLA (9a ed.)

Billinger, Robert D. Early Ironworks of Pennsylvania. The Durham Furnaces. Lehigh University, 1939.