Afriyie, S., J. Duo, K. Appiah, and A.-A. I. Musah. “The Nexus Between Types of Innovation and Marketing Performance of SME in an Emerging Economy”. International Review of Management and Marketing, vol. 8, no. 6, Nov. 2018, pp. 78-92, https://econjournals.com/index.php/irmm/article/view/7042.