Gaya APA

Sharp, A, M., Register, C, A. (2013). Economics of social issues. Twentieth Edition (Ed.Ke-12). Yogyakarta: Salemba Empat.

Gaya MLA

Sharp, Ansel, M.., Register, Charles, A.. "Economics of social issues. Twentieth Edition". Ed.Ke-12 Yogyakarta: Salemba Empat, 2013. Text.