Singh, V., R. K. Rana, and R. Singhal. “Application of Cluster Sampling Techniques for Analyzing the Effect of Dhatri Lauha – An Ayurvedic Formulation in Iron Deficiency Anaemia”. International Journal of Ayurvedic Medicine, vol. 2, no. 2, Sept. 2011, doi:10.47552/ijam.v2i2.70.