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Gaya APA

Elly, M, J. (2009). Sistem Informasi Geografi . Sumedang: Yogyakarta:Graha Ilmu.

Gaya MLA

Elly, Muhamad, Jafar. "Sistem Informasi Geografi". Sumedang: Yogyakarta:Graha Ilmu, 2009. Text.