Ghosh, G K, G N Chattopadhyay, and S Chattopadhyay. 2005. “Availability and Forms of Sulphur in Red and Lateritic Soils of Birbhum District of West Bengal*”. The Indian Journal of Agricultural Sciences 75 (6). https://epubs.icar.org.in/index.php/IJAgS/article/view/9378.