International Institute for Sustainable Development; UNEP; Ecologistics International; Pintér, L.; Cressman, D.R.; Zahedi, K.(IISD, Winnipeg, MB, CA, 1999)
International Institute for Sustainable Development; International Union for Conservation of Nature and Natural Resources - World Conservation Union; IDRC(1998)
International Institute for Sustainable Development; International Union for Conservation of Nature and Natural Resources(IISD, Winnipeg, MB, CA, 2000)
International Institute for Sustainable Development; UNEP; Pintér, L.; Zahedi, K.; Cressman, D.R.(International Institute for Sustainable Development, Winnipeg, MB, CA, 2000)