Christopherson, R. W. (2014). Geosystems: An introduction to physical geography (Eight edition, Pearson New International edition.). Pearson Education Limited.
Citazione stile Chigago Style (17a edizione)Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. Eight edition, Pearson New International edition. Harlow Essex, England: Pearson Education Limited, 2014.
Citatione MLA (9a ed.)Christopherson, Robert W. Geosystems: An Introduction to Physical Geography. Eight edition, Pearson New International edition. Pearson Education Limited, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.