(1992). Environmental regulation. Alexandria: Wakeman/Walworth Inc.
Chicago-čujuhus (17. p.)Environmental Regulation. Alexandria: Wakeman/Walworth Inc, 1992.
MLA-čujuhus (9. p.)Environmental Regulation. Alexandria: Wakeman/Walworth Inc, 1992.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.