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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
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
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