Heller, R. L. (1979). Earth science (2d ed.). Webster Division, McGraw-Hill.
Chicagoスタイル(17版)引用形式Heller, Robert L. Earth Science. 2d ed. New York: Webster Division, McGraw-Hill, 1979.
MLA(9版)引用形式Heller, Robert L. Earth Science. 2d ed. Webster Division, McGraw-Hill, 1979.
警告: この引用は必ずしも正確ではありません.