Gaya APA

Maguire, D, J., Black, J, M. (1991). Geographical information systems Vol. 1 dan Vol. 2 . England: Longman.

Gaya MLA

Maguire, David, J.., Black, James, Menzeis. "Geographical information systems Vol. 1 dan Vol. 2". England: Longman, 1991. Text.