Elwell, J. B. Bridge Axioms and Laws.
Chicago-čujuhus (17. p.)Elwell, J. B. Bridge Axioms and Laws.
MLA-čujuhus (9. p.)Elwell, J. B. Bridge Axioms and Laws.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)