Gaya APA

SOFJAN, A. (2012). Sustainable development: A challenge for Indonesia at Rio+20 Conference 2012 and Beyond . Jakarta: Pusat pendidikan dan pelatihan kementrian luar.

Gaya MLA

SOFJAN, Agustaviano. "Sustainable development: A challenge for Indonesia at Rio+20 Conference 2012 and Beyond". Jakarta: Pusat pendidikan dan pelatihan kementrian luar, 2012. Artikel.