Dyfyniad APA
Lo, C. P., & Yeung, A. K. W. (2002). Concepts and techniques of geographic information systems. Prentice Hall.
Dyfyniad Arddull Chicago
Lo, C. P., and Albert K. W. Yeung. Concepts and Techniques of Geographic Information Systems. Upper Saddle River, NJ: Prentice Hall, 2002.
Dyfyniad MLA
Lo, C. P., and Albert K. W. Yeung. Concepts and Techniques of Geographic Information Systems. Prentice Hall, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.