Swamy, S. R., and P. Mamatha. “Certain Subclasses Of Harmonic Starlike Functions Associated With Q-Analouge Of Ruscheweyh Operator”. Journal of Progressive Research in Mathematics, Vol. 16, no. 4, Aug. 2020, pp. 3109-21, http://www.scitecresearch.com/journals/index.php/jprm/article/view/1884.