Roberts, J. (1992). The penguin history of the world. Penguin.
Chicagoスタイル(17版)引用形式Roberts, J.M. The Penguin History of the World. 3rd.ed: Penguin, 1992.
MLA(9版)引用形式Roberts, J.M. The Penguin History of the World. Penguin, 1992.
警告: この引用は必ずしも正確ではありません.