General Bibliography
- Bongartz's - 1980 (II)
- Bongartz's - 1980 (III)
- Bongartz's - 1981
- Bongartz's - 1981 (II)
- Bongartz's - 1981 (III)
- Bongartz's - 1982
- Bongartz's - 1982 (II)
- Bongartz's - 1983
- Bongartz's - 1984
- Bongartz's - 1984 (II)
- Bongartz's - 1986
- Bongartz's - 1986 (II)
- Bongartz's - 1987
- Bongartz's - 1987 (II)
- Bongartz's - 1988 (II)
- Bongartz's - 1989
- Bongartz's - 1991
- Bongartz's - 1991 (II)
- Bongartz's - 1992
- Bongartz's - 1993