DeGregori, T. R. (2004). Origins of the organic agriculture debate. Blackwell.
Chicago-čujuhus (17. p.)DeGregori, Thomas R. Origins of the Organic Agriculture Debate. Iowa City: Blackwell, 2004.
MLA-čujuhus (9. p.)DeGregori, Thomas R. Origins of the Organic Agriculture Debate. Blackwell, 2004.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.