Abdulai, Awudu, and Renan Goetz. 2014. “Time-Related Characteristics of Tenancy Contracts and Investment in Soil Conservation Practices.” Environmental and Resource Economics 59 (1): 87–109. doi:10.1007/s10640-013-9719-y. Abdulai, Awudu, Victor Owusu, and Renan Goetz. 2011. “Land Tenure Differences and Investment in Land Improvement Measures: Theoretical and Empirical Analyses.” Journal of Development Economics 96 (1): 66–78. doi:10.1016/j.jdeveco.2010.08.002. Adwani, Nafis, and Ahadi Ahadu Deradjat.