1. Akbar, S. (2011). Andrographis paniculata: A Review of Pharmacological Activities and Clinical Effects. Alternative Medicine Review, 66-77.
2. Federer, Walter Theodore. (1955). Experimental Design, Theory And Application.
3. Hestianah, Eka Pramyrtha., Anwar, Chairul., Kuncorojakti, Suryo., Yustinasari, Lita Rakhma. (2014). Bahan Ajar Histologi Veteriner. In E. P. Hestianah, Bahan Ajar Histologi Veteriner (Jilid 2 ed., pp. 1-146). Surabaya: PT. Revka Petra Media.
4. Lakshmi, M. S., Reddy, U. K., & Rani, S. R. K. S. (2012). A review on medicinal plants for nephroprotective activity. Asian J Pharm Clin Res, 5(4), 8-14.
5. Mehotcheva, T. H. (2008). The Kruskal-Wallis Test. In Seminar in Methodology & Statistics: http://www. let. rug. nl/nerbonne/teach/rema-stats-methseminar/presentations/Mehotcheva-2008-Kruskal-Wallis. pdf.