References

References
MACHLIS, L., and J. G. TORREY. 1956. Plants in action. W. H. Freeman & Co., San Francisco. P. 17-18.
Machlis
17
Plants in action
1956
RAY, P. M.1972. The living plant. Holt, Rinehart and Win- ston, Inc., New York. Ch. 9-10.
Ray
Ch. 9-10
The living plant
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SALISBURY, F. B., and C. Ross. 1969. Plant physiology. Wads- worth Publishing Co., Belmont, Calif. Ch. 23.
Salisbury
Ch. 23
Plant physiology
1969
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