APA-čujuhus (7. p.)
Churella, A. J. (2013). The Pennsylvania Railroad. University of Pennsylvania Press.
Chicago-čujuhus (17. p.)
Churella, Albert J. The Pennsylvania Railroad. Philadelphia: University of Pennsylvania Press, 2013.
MLA-čujuhus (9. p.)
Churella, Albert J. The Pennsylvania Railroad. University of Pennsylvania Press, 2013.
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