APA Citatie

Society of Wetland Scientists Professional Certification Program. (1998). Registry of professional wetland scientists: 1997-1998. U.S.A: The Program.

Chicago Style citaat

Society of Wetland Scientists Professional Certification Program. Registry of Professional Wetland Scientists: 1997-1998. U.S.A: The Program, 1998.

MLA citatie

Society of Wetland Scientists Professional Certification Program. Registry of Professional Wetland Scientists: 1997-1998. U.S.A: The Program, 1998.