Lampkin, N. (1990). Organic farming (1a. ed.). Farming Press.
Chicago-čujuhus (17. p.)Lampkin, Nicolas. Organic Farming. 1a. ed. Ipswich: Farming Press, 1990.
MLA-čujuhus (9. p.)Lampkin, Nicolas. Organic Farming. 1a. ed. Farming Press, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.