Biu (Nigéria) (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Biu (Nigéria)" in Portuguese language version.

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doi.org

T. Kparmwang, I. E. Esu and V. O. Chude (12 de setembro de 1994). «Properties, classification and agricultural potential of basaltic soils in semi-arid Nigeria». Department of Soil Science, Ahmadu Bello University, Zaria, Nigeria. Journal of Arid Environments. 38: 117–128. doi:10.1006/jare.1997.0307. Consultado em 5 de outubro de 2009

T. Kparmwang, I. E. Esu and V. O. Chude (12 de setembro de 1994). «Properties, classification and agricultural potential of basaltic soils in semi-arid Nigeria». Department of Soil Science, Ahmadu Bello University, Zaria, Nigeria. Journal of Arid Environments. 38: 117–128. doi:10.1006/jare.1997.0307. Consultado em 5 de outubro de 2009