APA (7th ed.) Citation

Educational Challenges, Inc. (1983). World geography. D.C. Heath.

Chicago Style (17th ed.) Citation

Educational Challenges, Inc. World Geography. Lexington, Mass: D.C. Heath, 1983.

MLA (9th ed.) Citation

Educational Challenges, Inc. World Geography. D.C. Heath, 1983.

Warning: These citations may not always be 100% accurate.