Packard, L. O., Overton, B., & Wood, B. D. (1963). Geography of the world (4th ed., Revised.). New York : London: Macmillan Collier-Macmillan.
Παραπομπή Chicago StylePackard, Leonard O., Bruce Overton, and Ben D. Wood. Geography of the World. 4th ed., Revised. New York : London: Macmillan Collier-Macmillan, 1963.
Παραπομπή MLAPackard, Leonard O., Bruce Overton, and Ben D. Wood. Geography of the World. 4th ed., Revised. New York : London: Macmillan Collier-Macmillan, 1963.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.