APA ציטוט

Estes, J. S. ;. J. (1990). Geographic Information Systems An Introduction. Prentice Hall.

Chicago Style (17th ed.) Citation

Estes, Jeffrey Star ; John. Geographic Information Systems An Introduction. Prentice Hall, 1990.

ציטוט MLA

Estes, Jeffrey Star ; John. Geographic Information Systems An Introduction. Prentice Hall, 1990.