Tolera, H. “A Socio-Economic Linkage of Urban Informal Sector to Formal and Other Informal Sectors in Hawassa Town: Intensifying Growth from the Street”. Journal of Science, Technology and Arts Research, vol. 2, no. 1, Mar. 2013, pp. 95-102, https://journals.wgu.edu.et/index.php/star/article/view/114.