Downs, R. J., & Hellmers, H. (1975). Environment and experimental control of plant growth / (by) R.J. Downs and H. Hellmers. Academic Press.
Chicago Style (17th ed.) CitationDowns, Robert Jack, and Henry Hellmers. Environment and Experimental Control of Plant Growth / (by) R.J. Downs and H. Hellmers. London (etc.): Academic Press, 1975.
MLA (9th ed.) CitationDowns, Robert Jack, and Henry Hellmers. Environment and Experimental Control of Plant Growth / (by) R.J. Downs and H. Hellmers. Academic Press, 1975.
Warning: These citations may not always be 100% accurate.