(2012). An INTRODUCTION to physical geography and the environment. Pearson.
Chicago-viite (17. p.)An INTRODUCTION to Physical Geography and the Environment. Pearson, 2012.
MLA-viite (9. p.)An INTRODUCTION to Physical Geography and the Environment. Pearson, 2012.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.