Não informado. Forthcoming International Scientific and Technical Conferences. Department of Education and Science.
Chicago-referens (17:e uppl.)Não informado. Forthcoming International Scientific and Technical Conferences. London: Department of Education and Science.
MLA-referens (8:e uppl.)Não informado. Forthcoming International Scientific and Technical Conferences. Department of Education and Science.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.