APA način citiranja (7. izdanje)

Worrall, L. (1990). Geographic information systems: Developments and applications. Belhaven Press.

Čikaški stil citiranja (17. izdanje)

Worrall, Les. Geographic Information Systems: Developments and Applications. London ; New York: Belhaven Press, 1990.

MLA način citiranja (9. izdanje)

Worrall, Les. Geographic Information Systems: Developments and Applications. Belhaven Press, 1990.