APA-čujuhus (7. p.)
Roberts, J. M. (1992). The Penguin history of the world. Penguin Books.
Chicago-čujuhus (17. p.)
Roberts, J. M. The Penguin History of the World. London ; New York, N.Y., U.S.A.: Penguin Books, 1992.
MLA-čujuhus (9. p.)
Roberts, J. M. The Penguin History of the World. Penguin Books, 1992.
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