Gaya APA

Gallian, J, A., Swanson, C, P. (1990). **Contemporary abstract algebra . Masschusetts: Masschusetts: D.C. Heathand Co.; 1990..

Gaya MLA

Gallian, Joseph, A.., Swanson, Carl, P.. "**Contemporary abstract algebra". Masschusetts: Masschusetts: D.C. Heathand Co.; 1990., 1990. Text.