.Lo, C. P., & .Yeung, A. K. W. (2007). Concepts and techniques of geographic information systems (2nd ed.). Pearson Prentice Hall.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերում.Lo, C. P., and Albert K. W. .Yeung. Concepts and Techniques of Geographic Information Systems. 2nd ed. .Upper Saddle River, NJ: Pearson Prentice Hall, 2007.
MLA (9րդ խմբ.) Մեջբերում.Lo, C. P., and Albert K. W. .Yeung. Concepts and Techniques of Geographic Information Systems. 2nd ed. Pearson Prentice Hall, 2007.