Não informado. (1982). Environmental Research Center Papers. University of Tsukuba, Environmental Research Center.
Chicago-referens (17:e uppl.)Não informado. Environmental Research Center Papers. Ibaraki, Japão: University of Tsukuba, Environmental Research Center, 1982.
MLA-referens (8:e uppl.)Não informado. Environmental Research Center Papers. University of Tsukuba, Environmental Research Center, 1982.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.