St. Edward's University (Austin, Tex.). Center for Continuing Education. Environics Center. Environics Center records.
Chicago-referens (17:e uppl.)St. Edward's University (Austin, Tex.). Center for Continuing Education. Environics Center. Environics Center Records.
MLA-referens (8:e uppl.)St. Edward's University (Austin, Tex.). Center for Continuing Education. Environics Center. Environics Center Records.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.