Atisa, Delvin Nyaboke, Walter Okibo, and Lewis Omwando. 2014. “Effect of Procurement Methods on Operational Performance of Firms in the Softdrink Industries: A Case Study of Kisii Bottlers Limited”. The International Journal of Business & Management 2 (10). https://internationaljournalcorner.com/index.php/theijbm/article/view/137725.