Cita APA

By, R. A. 1., Knippers, R. A., Sun, Y., Ellis, M. C., & Kraak, M. (2001). Principles of geographic information systems: An introductory textbook (Second edition.). The Netherlands: ITC.

Citación estilo Chicago

By, Rudolphus Antonius 1960-, Richard A. Knippers, Yuxian Sun, Martin C. Ellis, y Menno-Jan Kraak. Principles of Geographic Information Systems: An Introductory Textbook. Second edition. The Netherlands: ITC, 2001.

Cita MLA

By, Rudolphus Antonius 1960-, et al. Principles of Geographic Information Systems: An Introductory Textbook. Second edition. The Netherlands: ITC, 2001.