Roberts, J. M. (1980). The Pelican history of the world. Harmondsworth: Penguin Books.
Trích dẫn kiểu ChicagoRoberts, J. M. The Pelican History of the World. Harmondsworth: Penguin Books, 1980.
MLA引文Roberts, J. M. The Pelican History of the World. Harmondsworth: Penguin Books, 1980.
警告:這些引文格式不一定是100%准確.