ABDULLAHI NUHU JEGA; GRACE THOMAS RANGO; MUHAMMAD BELLO FAKAI; BUNYAMIN AYODEJI OLAWUMI; ABDULHAMID ISYAKU SHAGARI. Assessing the Effects of Contract Variations on Building Construction Delivery. African Journal of Environmental Sciences and Renewable Energy, Nigeria, v. 21, n. 1, p. 94–112, 2025. DOI: 10.62154/ajesre.2025.021.01015. Disponível em: https://afropolitanjournals.com/index.php/ajesre/article/view/1231.. Acesso em: 27 oct. 2026.