Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
Chicago-čujuhus (17. p.)Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
MLA-čujuhus (9. p.)Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.