Gaya APA

[et.al], A, C., Atmadilaga, A, H. (2009). Indonesian Geographical Expedition Nort Sumatra 2009 . Cianjur: PSSDAD - BAKOSURTANAL.

Gaya MLA

[et.al], Agung, Christanto., Atmadilaga, Agus, Hermawan. "Indonesian Geographical Expedition Nort Sumatra 2009". Cianjur: PSSDAD - BAKOSURTANAL, 2009. Text.