Virgilio M, V. (1996). Certification of forest products: Issues and perspectives. Island Press.
Chicago-čujuhus (17. p.)Virgilio M, Viana. Certification of Forest Products: Issues and Perspectives. Washington, D.C.: Island Press, 1996.
MLA-čujuhus (9. p.)Virgilio M, Viana. Certification of Forest Products: Issues and Perspectives. Island Press, 1996.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.