Cita APA (7th ed.)

Marble, D. F., Calkins, H. W., & Peuquet, D. J. (1984). Basic readings in geographic information systems. SPAD Systems.

Cita Chicago (17th ed.)

Marble, Duane F., Hugh W. Calkins, i Donna J. Peuquet. Basic Readings in Geographic Information Systems. Williamsville, N.Y: SPAD Systems, 1984.

Cita MLA (9th ed.)

Marble, Duane F., et al. Basic Readings in Geographic Information Systems. SPAD Systems, 1984.