Gaya APA
The Indonesian Jounal Geography Vol.21 No.61 June 1991
.
().
Yogyakarta, Indonesia:
Gadjah Mada University.
Gaya MLA
The Indonesian Jounal Geography Vol.21 No.61 June 1991
.
.
Yogyakarta, Indonesia:
Gadjah Mada University,
.
.