APA
Birthal P. S., . (2003). Economic potential of biological substitutes for agrochemicals. New Delhi: National Centre for Agricultural Economics nad Policy Research.
Chicago
Birthal Pratap S, . 2003. Economic potential of biological substitutes for agrochemicals. New Delhi: National Centre for Agricultural Economics nad Policy Research.
Harvard
Birthal P. S., . (2003). Economic potential of biological substitutes for agrochemicals. New Delhi: National Centre for Agricultural Economics nad Policy Research.
MLA
Birthal Pratap S, . Economic potential of biological substitutes for agrochemicals. New Delhi: National Centre for Agricultural Economics nad Policy Research. 2003.