Cita APA (7th ed.)

Star, J., & Estes, J. (1990). Geographic Information Systems: An introduction. Prentice Hall.

Cita Chicago (17th ed.)

Star, Jeffrey, i John Estes. Geographic Information Systems: An Introduction. Englewood Cliffs, N.J.: Prentice Hall, 1990.

Cita MLA (9th ed.)

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