Educational Challenges, I. (1983). World geography. Heath.
Chicagoスタイル(17版)引用形式Educational Challenges, Inc. World Geography. Lexington, MA: Heath, 1983.
MLA(9版)引用形式Educational Challenges, Inc. World Geography. Heath, 1983.
警告: この引用は必ずしも正確ではありません.
APA(7版)引用形式