APA
Ibanga I J, Ekong E S & Igbuku P A. (2007). Variability in physico-chemical properties of selected rubber growing soils of South-Eastern Nigeria. : Natural Rubber Research.
Chicago
Ibanga I J, Ekong E S and Igbuku P A. 2007. Variability in physico-chemical properties of selected rubber growing soils of South-Eastern Nigeria. : Natural Rubber Research.
Harvard
Ibanga I J, Ekong E S and Igbuku P A. (2007). Variability in physico-chemical properties of selected rubber growing soils of South-Eastern Nigeria. : Natural Rubber Research.
MLA
Ibanga I J, Ekong E S and Igbuku P A. Variability in physico-chemical properties of selected rubber growing soils of South-Eastern Nigeria. : Natural Rubber Research. 2007.