APA引文

Gray, R. (1961). A history of the Southern Sudan, 1839-1889. Oxford University Press.

Chicago Style (17th ed.) Citation

Gray, Richard. A History of the Southern Sudan, 1839-1889. [London]: Oxford University Press, 1961.

MLA引文

Gray, Richard. A History of the Southern Sudan, 1839-1889. Oxford University Press, 1961.