Chitenderu, Tafadzwa T., Andrew Maredza, and Kin Sibanda. “The Random Walk Theory And Stock Prices: Evidence From Johannesburg Stock Exchange”. International Business & Economics Research Journal (IBER) 13, no. 6 (October 31, 2014): 1241-1250. Accessed August 23, 2020. https://clutejournals.com/index.php/IBER/article/view/8918.