Kamran Azeem, Ayub Khan, Abid Mehmood, Khalid Naveed,, AND Shah Masaud Khan, Naushad Ali,. " 10. Sowing time and nitrogen application methods impact on production traits of Kalonji (Nigella sativa L.)" Pure and Applied Biology (PAB) [Online], Volume 7 Number 2 (19 May 2018)