Citazione Stile APA (7a Edizione)

National Association of Environmental Professionals. (1999). Environmental practice. Taylor & Francis.

Citazione stile Chigago Style (17a edizione)

National Association of Environmental Professionals. Environmental Practice. [Abingdon?]: Taylor & Francis, 1999.

Citatione MLA (8a ed.)

National Association of Environmental Professionals. Environmental Practice. Taylor & Francis, 1999.