biological control

Altieri, Miguel A., and Matt Liebman. (1988) 1988. Weed Management in Agroecosystems: Ecological Approaches. Boca Raton, FL: CRC Press, Inc. http://www.worldcat.org/oclc/16682275.

Thurston, H. David, and Neil R. Miller. (1990) 1990. “Traditional Agriculture and Plant Pathology (TAPP) Database [ASCII Format for the Macintosh]”. Ithaca, NY: Cornell University Department of Plant Pathology.