CHANGE KANG -TSUNG. (2016). INTRODUCTION TO GEOGRAPHIC INFORMATION SYSTEMS. MC GRAW HILL.
Chicago-viite (17. p.)CHANGE KANG -TSUNG. INTRODUCTION TO GEOGRAPHIC INFORMATION SYSTEMS. NEW DELHI: MC GRAW HILL, 2016.
MLA-viite (9. p.)CHANGE KANG -TSUNG. INTRODUCTION TO GEOGRAPHIC INFORMATION SYSTEMS. MC GRAW HILL, 2016.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.