APA-čujuhus (7. p.)

U.S. Environmental Protection Agency. Introduction to the national pretreatment program.

Chicago-čujuhus (17. p.)

U.S. Environmental Protection Agency. Introduction to the National Pretreatment Program.

MLA-čujuhus (9. p.)

U.S. Environmental Protection Agency. Introduction to the National Pretreatment Program.

Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.