Julien, P. Y. An introduction to physical geography and the environment (3a ed.).
Citazione stile Chigago Style (17a edizione)Julien, Pierre Y. An Introduction to Physical Geography and the Environment. 3a ed.
Citatione MLA (8a ed.)Julien, Pierre Y. An Introduction to Physical Geography and the Environment. 3a ed.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.