Tawfiq, Arwa A. “Estimation Levels of Indol Acetic Acid (IAA) and Gibberellic Acid (GA3) from Dry Bakery Yeast Saccharomyces Cereviciae”. Journal of Biotechnology Research Center, vol. 4, no. 2, June 2010, pp. 94-100, doi:10.24126/jobrc.2010.4.2.133.