Biskupski. The Most Dangerous German Agent in America. Cornell University Press.
Chicago-čujuhus (17. p.)Biskupski. The Most Dangerous German Agent in America. Cornell University Press.
MLA-čujuhus (9. p.)Biskupski. The Most Dangerous German Agent in America. Cornell University Press.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.