المؤلفون: Kiplagat, J. K.^Aff4, Okalebo, J. R.^{Aff4, Aff5}, Serrem, C. K.^Aff4, Mbakaya, D. S.^Aff6, Jama, B.^Aff7

المساهمون: Vanlauwe, Bernard, editor^Aff1, van Asten, Piet, editor^Aff2, Blomme, Guy, editor^Aff3

المصدر: Challenges and Opportunities for Agricultural Intensification of the Humid Highland Systems of Sub-Saharan Africa. :177-186

المؤلفون: Bünemann, E.K., Smithson, P.C., Jama, B., Frossard, E., Oberson, A.

المصدر: Plant and Soil, 2004 Jul 01. 264(1/2), 195-208.

URL الوصول: https://www.jstor.org/stable/42952012

المؤلفون: George, T.S., Gregory, P.J., Robinson, J.S., Buresh, R.J., Jama, B.

المصدر: Plant and Soil, 2002 Sep 01. 246(1), 53-63.

URL الوصول: https://www.jstor.org/stable/24120946

المؤلفون: Jama, B. A., Mutegi, J. K., Njui, A. N.

المصدر: Agroforestry Systems: An International Journal incorporating Agroforestry Forum. June 2008 73(2):155-166

المؤلفون: Mathimaran, N., Ruh, R., Jama, B., Verchot, L., Frossard, E., Jansa, J.

المصدر: In Agriculture, Ecosystems and Environment 2007 119(1):22-32

المؤلفون: George, T. S., Gregory, P. J., Robinson, J. S., Buresh, R. J., Jama, B. A.

المصدر: Agroforestry Systems: An International Journal incorporating Agroforestry Forum. August 2001 52(3):199-205

المؤلفون: Jama, B., Palm, C. A., Buresh, R. J., Niang, A., Gachengo, C., Nziguheba, G., Amadalo, B.

المصدر: Agroforestry Systems: An International Journal incorporating Agroforestry Forum. July 2000 49(2):201-221

المؤلفون: Bünemann, E.^Aff12, Oberson, A.^Aff12, Smithson, P. C.^Aff13, Jama, B.^Aff13, Frossard, E.^Aff12

المساهمون: Horst, W. J., editor^Aff1, Schenk, M. K., editor^Aff1, Bürkert, A., editor^Aff2, Claassen, N., editor^Aff3, Flessa, H., editor^Aff3, Frommer, W. B., editor^Aff4, Goldbach, H., editor^Aff5, Olfs, H. -W., editor^Aff6, Römheld, V., editor^Aff7, Sattelmacher, B., editor^Aff8, Schmidhalter, U., editor^Aff9, Schubert, S., editor^Aff10, v. Wirén, N., editor^Aff4, Wittenmayer, L., editor^Aff11

المصدر: Plant Nutrition : Food security and sustainability of agro-ecosystems through basic and applied research. 92:1016-1017

المؤلفون: Gachengo, C. N., Palm, C. A., Jama, B., Othieno, C.

المصدر: Agroforestry Systems: An International Journal incorporating Agroforestry Forum. November 1998 44(1):21-35

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