1. Abubakar, S. M., & Mundi, R. (2000). Federal capital territory, Abuja. In A. B. Mamman, A. O. Oyebanji, & S. W. Petters (Eds.), Nigeria—A Country United, a future assured (pp. 561–578). Abuja: Federal Ministry of Information.
2. Adams, W. M., & Watson, E. E. (2003). Soil erosion, indigenous irrigation and environmental sustainability, Marakwet, Kenya. Land Degradation and Development, 14(1), 109–122.
3. Aktürk, D., Gün, S., & Kumuk, T. (2007). Multiple correspondence analysis technique used in analyzing the categorical data in social sciences. Journal of Applied Sciences, 7(4), 585–588.
4. Alcorn, J. B. (1992). Ethnobotanical knowledge systems: A resource for meeting rural development goals. In D. M. Warren, D. Brokensha, L. Jan Slikkerveer (Eds.), Indigenous knowledge systems: The cultural dimension of development (pp. 67–72). London: Kegan Paul International.
5. Arnalds, A. (2005). Approaches to landcare—A century of soil conservation in Iceland. Land Degradation and Development, 16(2), 113–125.