Wells, J., & Sutcliffe, L. G. (1997). Environmental engineering and support services: A handbook for exporters from developing countries. International Trade Centre UNCTAD/WTO.
Chicago-referens (17:e uppl.)Wells, Jeremy, och Leni G. Sutcliffe. Environmental Engineering and Support Services: A Handbook for Exporters from Developing Countries. Geneva: International Trade Centre UNCTAD/WTO, 1997.
MLA-referens (9:e uppl.)Wells, Jeremy, och Leni G. Sutcliffe. Environmental Engineering and Support Services: A Handbook for Exporters from Developing Countries. International Trade Centre UNCTAD/WTO, 1997.
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