Verma, P. S. (1983). Environmental Biology: Principles of Ecology (1st. ed.). S. Chand & Company Ltd..
Chicagoスタイル(17版)引用形式Verma, P. S. Environmental Biology: Principles of Ecology. 1st. ed. New Delhi: S. Chand & Company Ltd., 1983.
MLA(9版)引用形式Verma, P. S. Environmental Biology: Principles of Ecology. 1st. ed. S. Chand & Company Ltd., 1983.
警告: この引用は必ずしも正確ではありません.