Burton, O. V., Cross, W., & Campbell, E. (2014). Penn Center: A history preserved. The University of Georgia Press.
Chicago-čujuhus (17. p.)Burton, Orville Vernon, Wilbur Cross, juo Emory Campbell. Penn Center: A History Preserved. Athens, Georgia: The University of Georgia Press, 2014.
MLA-čujuhus (9. p.)Burton, Orville Vernon, et al. Penn Center: A History Preserved. The University of Georgia Press, 2014.
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