World Resources Institute. (1993). The 1993 Information please environmental almanac. Houghton Mifflin Co.
Chicagoスタイル(17版)引用形式World Resources Institute. The 1993 Information Please Environmental Almanac. Boston: Houghton Mifflin Co, 1993.
MLA(9版)引用形式World Resources Institute. The 1993 Information Please Environmental Almanac. Houghton Mifflin Co, 1993.
警告: この引用は必ずしも正確ではありません.