Abraha Z, Taddesse A, Yohannes M, Birhane E and Beyene G 2018:  
Milk clotting characteristics of Solanum incanum, Ficus carica and Rhus natalensis for cheese making in Tigray, Northern Ethiopia. 
 Livestock Research for Rural Development. Volume 30, Article #74. 
 Retrieved 
, from http://www.lrrd.org/lrrd30/4/gebrem30074.html