Gaya APA

ARAS, G., CROWTHER, D. (2008). Evaluating Sustainability: a Need for Standards . : Universitas Sebelas Maret-Fak Ekonomi.

Gaya MLA

ARAS, Guler., CROWTHER, David. "Evaluating Sustainability: a Need for Standards". : Universitas Sebelas Maret-Fak Ekonomi, 2008. Artikel.