Gaya APA

al.], P, A, L, ., [., Tjokrosoewarno, S. (1999). Geographical information systems Vol. 2: management issues and applications . New York: John Wiley & Sons.

Gaya MLA

al.], Paul, A., Longley, ..., [et., Tjokrosoewarno, Soekatjo. "Geographical information systems Vol. 2: management issues and applications". New York: John Wiley & Sons, 1999. Text.