Cita APA (7th ed.)

Crouch, R. (1966). Algebraic systems. Scott, Foresman and Company.

Cita Chicago (17th ed.)

Crouch, Ralph. Algebraic Systems. Glenview, Illinois: Scott, Foresman and Company, 1966.

Cita MLA (9th ed.)

Crouch, Ralph. Algebraic Systems. Scott, Foresman and Company, 1966.