1968=1969,4; 1969=1970,9; 1970=1971,12; 1971=1972,4; 1972=1973,7; 1973=1974,9; 1974=1975,11; 1975=1976,8; 1976=1977,4; 1977=1978,8; 1978=1979,7; 1979=1980,13; 1980=1981,8; 1981=1982,5; 1982=1983,6; 1983=1984,6; 1984=1985,6; 1985=1986,8; 1986=1987,4; 1987=1988,5; 1988=1989,4; 1989=1990,5; 1990=1991,6; 1991=1992,8; 1992=1993,8; 1993=1994,5; 1994=1995,5; 1995=1996,9; 1996=1997,5; 1997=1998,8; 1998=1999,4; 1999=2000,8; 2000=2001,7; 2001=2002,5; 2002=2003,8; 2003=2004,11; 2004=2005,4; 2005/06=2007,5; 2007=2008,7; 2008=2009,7 von: [Der Betrieb / Beilage] (ISSN: 0171-9181)
