Gaya APA

The Indonesian Jounal of Geography Vol. 15-16 No. 49-51 June 1985-1986. (). Yogyakarta, Indonesia: Gadjah Mada University.

Gaya MLA

The Indonesian Jounal of Geography Vol. 15-16 No. 49-51 June 1985-1986. . Yogyakarta, Indonesia: Gadjah Mada University, . .