ASSE Journal. American Society of Safety Professionals (ASSP).
Chicago-čujuhus (17. p.)ASSE Journal. American Society of Safety Professionals (ASSP).
MLA-čujuhus (9. p.)ASSE Journal. American Society of Safety Professionals (ASSP).
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.