APA
Pulsipher L. M., Pulsipher A. & Hapke H. M. (2008). World regional geography. New York: W.H. Freeman.
Chicago
Pulsipher Lydia M, Pulsipher Alex and Hapke Holly M. 2008. World regional geography. New York: W.H. Freeman.
Harvard
Pulsipher L. M., Pulsipher A. and Hapke H. M. (2008). World regional geography. New York: W.H. Freeman.
MLA
Pulsipher Lydia M, Pulsipher Alex and Hapke Holly M. World regional geography. New York: W.H. Freeman. 2008.