APA استشهاد

Sawyer, L. A., & Mitchell, W. H. (1973). The liberty ships: :the history of the emergency type cargo ships constructed in the U S during world war ii (Rev.ed.2.). David and charles.

استشهاد بنمط شيكاغو

Sawyer, L A., و W H. Mitchell. The Liberty Ships: :the History of the Emergency Type Cargo Ships Constructed in the U S During World War Ii. Rev.ed.2. Newton: David and charles, 1973.

MLA استشهاد

Sawyer, L A., و W H. Mitchell. The Liberty Ships: :the History of the Emergency Type Cargo Ships Constructed in the U S During World War Ii. Rev.ed.2. David and charles, 1973.