Gaya APA
The Indonesian Jounal of Geography Vol.19 No.57 June 1989
.
().
Yogyakarta, Indonesia:
Gadjah Mada University.
Gaya MLA
The Indonesian Jounal of Geography Vol.19 No.57 June 1989
.
.
Yogyakarta, Indonesia:
Gadjah Mada University,
.
.