(1998). Quality control at the U.S. Geological Survey, National Water Quality Laboratory.
Chicago-čujuhus (17. p.)Quality Control at the U.S. Geological Survey, National Water Quality Laboratory. 1998.
MLA-čujuhus (9. p.)Quality Control at the U.S. Geological Survey, National Water Quality Laboratory. 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.