Não informado. (2018). Publication. University of Michigan, Great Lakes Research Division.
Chicago-referens (17:e uppl.)Não informado. Publication. Ann Arbor, Mich: University of Michigan, Great Lakes Research Division, 2018.
MLA-referens (8:e uppl.)Não informado. Publication. University of Michigan, Great Lakes Research Division, 2018.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.