CALISKAN, S., H. YETISIR, and S. KARANLIK. “Combined Use of Green Manure and Farmyard Manure Allows Better Nutrition of Organic Lettuce”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, vol. 42, no. 1, June 2014, pp. 248-54, doi:10.15835/nbha4219328.