Gaya APA

Swanson, C, P., Gallian, J, A. (1990). **Contemporary abstract algebra . Toronto: Toronto: D.C. Heath and Company; 1990.

Gaya MLA

Swanson, Carl, P.., Gallian, Joseph, A.. "**Contemporary abstract algebra". Toronto: Toronto: D.C. Heath and Company; 1990, 1990. Text.