ebrary, Inc, Upadhyaya, M. K., & Blackshaw, R. E. (2007). Non-chemical weed management: Principles, concepts, and technology. CABI.

ebrary, Inc, Mahesh K. Upadhyaya, and Robert E. Blackshaw. Non-chemical Weed Management: Principles, Concepts, and Technology. Cambridge, MA: CABI, 2007.

ebrary, Inc, et al. Non-chemical Weed Management: Principles, Concepts, and Technology. CABI, 2007.