Παραπομπή APA

Sawyer, W. W. (1959). Concrete approach to abstract algebra. Freeman.

Παραπομπή Chicago Style

Sawyer, W W. Concrete Approach to Abstract Algebra. London: Freeman, 1959.

Παραπομπή MLA

Sawyer, W W. Concrete Approach to Abstract Algebra. Freeman, 1959.