APA
National Geographic V.6The 1950s Jan 1950-Apr 1931. Washington: National G. Soc.
Chicago
National Geographic V.6The 1950s Jan 1950-Apr 1931. Washington: National G. Soc.
Harvard
National Geographic V.6The 1950s Jan 1950-Apr 1931. Washington: National G. Soc.
MLA
Washington: National G. Soc. .