Cita APA (7th ed.)

Allen, R. M. (1939). The microscope in elementary cast iron metallurgy. American foundrymen's association.

Cita Chicago (17th ed.)

Allen, Roy Morris. The Microscope in Elementary Cast Iron Metallurgy. [Chicago]: American foundrymen's association, 1939.

Cita MLA (8th ed.)

Allen, Roy Morris. The Microscope in Elementary Cast Iron Metallurgy. American foundrymen's association, 1939.