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Vierich, H I D and Stoop, W A (1990) Changes in West African Savanna agriculture in response to growing population and continuing low rainfall. Agriculture, Ecosystems and Environment, 31 (2). pp. 115-132. ISSN 0167-8809
Stoop, W A (1987) Adaptation of sorghum/maize and sorghum/pearl millet intercrop systems to the toposequence land types in the North Sudanian zone of the west African Savanna. Field Crops Research, 16 (3). pp. 255-272.
Stoop, W A (1986) Agronomic management of cereal/cowpea cropping systems for major toposequence land types in the West African sacanna. Field Crops Research, 14. pp. 301-319. ISSN 0378-4290
Van Staveren, J Ph and Stoop, W A (1985) Adaptation to toposequence land types in West Africa of different sorghum genotypes in comparison with local cultivars of sorghum, millet, and maize. Field Crops Research, 11. pp. 13-35.
Stoop, W A (1980) Ion adsorption mechanisms in oxidic soils; implications for point of zero charge determinations. Geoderma, 23 (04). pp. 303-314. ISSN 0016-7061