Hossain, A, MT Tasmim, MA Nahar, and MR Karim. “Yield and Quality of Summer Onion Seeds As Influenced by Vernalization and Boron Application”. Progressive Agriculture 30, no. 4 (April 29, 2020): 371-378. Accessed January 24, 2021. https://www.banglajol.info/index.php/PA/article/view/46896.