Srinivas, T, SJH Rizvi, A Aw-Hassan, A R Manan, and M s Kadian. 2013. “TECHNICAL EFFICIENCY OF SEED POTATO FARMERS OF BADAKSHAN PROVINCE OF AFGHANISTAN”. Potato Journal 39 (2). https://epubs.icar.org.in/index.php/PotatoJ/article/view/32160.