Cita APA (7th ed.)

Maguire, D. J., & Goodchild, M. F. (1991). Geographical information systems: Principles and applications. Longman scientific and Technical.

Cita Chicago (17th ed.)

Maguire, David J., i Michael F. Goodchild. Geographical Information Systems: Principles and Applications. Harlow, Essex, England: Longman scientific and Technical, 1991.

Cita MLA (9th ed.)

Maguire, David J., i Michael F. Goodchild. Geographical Information Systems: Principles and Applications. Longman scientific and Technical, 1991.