1. Special report on community gardening in the U.S.;Sommers,1985
2. Home gardening in international development: What the literature shows;Brownrigg,1985
3. U.S. Department of Health Education and Welfare, Health Services and Mental Health Administration, Public Health Service, National Center for Health Statistics.,1977
4. Measures of social psychological attitudes;Robinson,1970
5. Unpublished data of horticultural trials of vegetable yields, 1986–1988;Weintieger,1989