KHAN, F U, F A MALIK, F A KHAN, and M A A A SIDDIQUE. 2011. “Effect of Plant Growth Regulators on Growth, Physiological Behaviour and Flower Quality of ’Cassini’ tulip(Tulipa Gesneriana )”. The Indian Journal of Agricultural Sciences 77 (10). https://epubs.icar.org.in/index.php/IJAgS/article/view/3448.