References
- J. Vreeland, Scientific American, 280(4), 112(1999)
- J. Vreeland, International Development Research Center Reports, 10(2), 4-5(1987)
- R. William, Sustainable Cities: Urbanization and the Environment an International Perspective, 9(1998)
- J. Vreeland, Global Pesticide Campaigner, 6(1992)
- I. R. Hardin and J. Kim, Colourage Annual, 43(2000)