1. Albrecht, Don E., & Murdock, Steve H. (1984). Toward a human ecological perspective on part-time farming. Rural Sociology, 49, 389 - 411.
2. Albrecht, Don E., & Murdock, Steve H. (1985b). The consequences of irrigation development in the Great Plains, Department of Rural Sociology Technical Report 85-I. College Station, TX: Texas Agricultural Experiment Station.
3. Albrecht, Don E., & Murdock, Steve H. (1986). Natural resource availability and social change. Sociological Inquiry, 56, 381 - 400.
4. Beale, Calvin L. (1979). Demographic aspects of agricultural structure. In Economics, statistics and cooperatives service, structure issues of American agriculture (pp. 80-85), Economics, Statistics, and Cooperative Service Agricultural Economic Report 438. Washington, DC: U.S. Department of Agriculture.
5. Beale, Calvin L. (1980). The changing nature of rural employment. In D. L. Brown & J. W. Wardwell (Eds.), New directions in urban-rural migration (pp. 37 - 49 ). New York: Academic Press.