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(1) Plant and Cell Physiology. (n.d.). Retrieved September 16, 2015.

(2) Whippo, C. (2006, May 1). Phototropism: Bending towards Enlightenment. Retrieved September 16, 2015.

(3) Theories Behind Plant Tissue Culture. (n.d.). Retrieved September 16, 2015.

(4) McClintock, N. Agroforestry and Sustainable Resource Conservation in Haiti: A Case Study (1st ed., pp. 1-2).

(5) Orodho, A. (n.d.). Kenya. Retrieved September 16, 2015.

(6) The Soils of Australia. (2012, November 23). Retrieved September 16, 2015.

(7) Byrne, J. (2003, September 19). Fact Sheet: Sandy Soil Organics. Retrieved September 16, 2015.

(8) Nordström, A., Jacobs, F., & Eliasson, L. (1991). Effect of Exogenous Indole-3-Acetic Acid and Indole-3-Butyric Acid on Internal Levels of the Respective Auxins and Their Conjugation with Aspartic Acid during Adventitious Root Formation in Pea Cuttings. Retrieved September 16, 2015.

(9) Epstein, E., & Ludwig-Müller, J. (2006, April 28). Indole-3-butyric acid in plants: Occurrence, synthesis, metabolism and transport. Retrieved September 16, 2015.

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