Gaya APA

Cambell, M, R. (1990). Ecomomics : Principles, Problems, And Policies (edisi 11). : Mc Graw Hill publishing company.

Gaya MLA

Cambell, McConnell, R. "Ecomomics : Principles, Problems, And Policies". edisi 11 : Mc Graw Hill publishing company, 1990. Text.