Gregory, K. (1979). environmental processes; a: Physical geography perspective. Dawson.
Citazione stile Chigago Style (17a edizione)Gregory, K.J. Environmental Processes; a: Physical Geography Perspective. Kent: Dawson, 1979.
Citatione MLA (9a ed.)Gregory, K.J. Environmental Processes; a: Physical Geography Perspective. Dawson, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.