Germany (West). Presse- und Informationsamt. (1971). Kassel, May 21, 1970: A documentation. Press and Information Office of the Federal Government.
Chicago-referens (17:e uppl.)Germany (West). Presse- und Informationsamt. Kassel, May 21, 1970: A Documentation. [S.l.]: Press and Information Office of the Federal Government, 1971.
MLA-referens (8:e uppl.)Germany (West). Presse- und Informationsamt. Kassel, May 21, 1970: A Documentation. Press and Information Office of the Federal Government, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.