Παραπομπή APA

ball Desmond and Babbage Ross. (1989). Geographic information systems: Defence applications. Pergamon.

Παραπομπή Chicago Style

ball Desmond and Babbage Ross. Geographic Information Systems: Defence Applications. Australia: Pergamon, 1989.

Παραπομπή MLA

ball Desmond and Babbage Ross. Geographic Information Systems: Defence Applications. Pergamon, 1989.