Acharya, P., P. Shilpkar, and A. Shah. “Biogas Production from Castor (Ricinus Communis Linn) Seedcake in the Presence and Absence of Buffalo Dung”. Vidyapith (વિદ્યાપીઠ), vol. 53, no. 4, Dec. 2015, pp. 5-16, http://journal.gujaratvidyapith.org/index.php/vp/article/view/60.