Society of Wetland Scientists Professional Certification Program. (1998). Registry of professional wetland scientists: 1997-1998. U.S.A: The Program.
Chicago-стиль цитированияSociety of Wetland Scientists Professional Certification Program. Registry of Professional Wetland Scientists: 1997-1998. U.S.A: The Program, 1998.
MLA-цитированиеSociety of Wetland Scientists Professional Certification Program. Registry of Professional Wetland Scientists: 1997-1998. U.S.A: The Program, 1998.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.