1.

図書
図書
1. World geography today
David M. Helgren, Robert J. Sager, Saul Israel
出版情報: New York : Holt, Rinehart and Winston, c1985
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2.

図書
図書
2. People, places, and change : an introduction to world studies
Robert J. Sager, David M. Helgren, Alison S. Brooks
出版情報: Austin : Holt, Rinehart and Winston, c2003
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3.

図書
図書
3. People, places, and change : an introduction to world studies. Annotated teacher's ed
[Robert J. Sager, David M. Helgren, Alison S. Brooks]
出版情報: Austin : Holt, Rinehart and Winston, c2003
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