Hatskevich, A., and J. E. Essilfie. “SHEA PICKING AS AN ENGINE OF POVERTY REDUCTION IN NORTHERN GHANA (CASE STUDY: FOUR COMMUNITIES IN THE BOLGATANGA MUNICIPALITY)”. European Scientific Journal, ESJ, vol. 9, no. 23, Aug. 2013, doi:10.19044/esj.2013.v9n23p%p.