G. A. Fojo and C. Allais, “The Socio-cultural and Economic Conditions Contributed to Illegal Migration in Omo Nada District, Jimma Zone, Oromia National Regional State, South West Ethiopia”, RSD, vol. 8, no. 7, p. e31871092, May 2019, doi: 10.33448/rsd-v8i7.1092.