APA aipamena

(1991). Geographical information systems: Principles and applications. Harlow, Essex, England: Longman Scientific & Technical.

Chicago Style aipamena

Geographical Information Systems: Principles and Applications. Harlow, Essex, England: Longman Scientific & Technical, 1991.

MLA aipamena

Geographical Information Systems: Principles and Applications. Harlow, Essex, England: Longman Scientific & Technical, 1991.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.