Akpalu, M., J. Sarkodie-Addo, and S. Akpalu. “Effect of Spacing on Growth and Yield of Five Bambara Groundnut (Vigna Subterranea (L) Verdc.) Landraces”. Journal of Science and Technology, Vol. 32, no. 2, Feb. 2016, doi:10.4314/just.v32i2.423.