1. Ecology and motivation;Barker,1960
2. Learning Theories for Teachers;Bigge,1971
3. Innovation diffusion and development in a third world setting: the cooperative movement in Sierra Leone;Brown;Soc. Sci. Quart,1979
4. A new look at adopter categories and an alternative proposal for target grouping of farming community;Chamala;Ind. J. Exten. Educ.,1980
5. Innovation and farm development—a multi-dimensional model;Crouch;Sociolog. Rural.,1972