RICHARDS, R. (1991). An Early Start To The Environment. Simon & Schuster.
Chicagoスタイル(17版)引用形式RICHARDS, Roy. An Early Start To The Environment. Simon & Schuster, 1991.
MLA(8版)引用形式RICHARDS, Roy. An Early Start To The Environment. Simon & Schuster, 1991.
警告: この引用は必ずしも正確ではありません.