Samad, MA, M Husain, M Begum, and MA Hossain. 2009. “Effects of Sowing Dates on the Incidence of Mustard Sawflies, Mustard Aphids and Its Predator, the Lady Bird Beetles”. Bangladesh Journal of Zoology 35 (2):319-24. https://banglajol.info/index.php/BJZ/article/view/2452.