Walther, J. (2014). Earth's natural resources. Jones & Bartlett Learning.
シカゴスタイル引用形Walther, John. Earth's Natural Resources. Burlington, MA: Jones & Bartlett Learning, 2014.
MLA引用形式Walther, John. Earth's Natural Resources. Jones & Bartlett Learning, 2014.
警告: この引用は必ずしも正確ではありません.