Roberts, J. (1992). The penguin history of the world. Penguin.
Chicago-čujuhus (17. p.)Roberts, J.M. The Penguin History of the World. 3rd.ed: Penguin, 1992.
MLA-čujuhus (9. p.)Roberts, J.M. The Penguin History of the World. Penguin, 1992.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.