Cleaver, K. M., & Schreiber, G. A. (1994). Reversing the spiral: The population, agriculture, and environment nexus in Sub-Saharan Africa. World Bank.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিCleaver, Kevin M., এবং Götz A. Schreiber. Reversing the Spiral: The Population, Agriculture, and Environment Nexus in Sub-Saharan Africa. Washington, D.C.: World Bank, 1994.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিCleaver, Kevin M., এবং Götz A. Schreiber. Reversing the Spiral: The Population, Agriculture, and Environment Nexus in Sub-Saharan Africa. World Bank, 1994.