APA
Gresswell R. K., . (1967). Physical geography. London: Longmans Green & Company.
Chicago
Gresswell R Kay, . 1967. Physical geography. London: Longmans Green & Company.
Harvard
Gresswell R. K., . (1967). Physical geography. London: Longmans Green & Company.
MLA
Gresswell R Kay, . Physical geography. London: Longmans Green & Company. 1967.