1955
Monograptus gerhardi — Kühne, pp. 368, fig. 4A-F
1979
? Monograptus vulgaris (Kühne) — Jaeger & Robardet, fig. 1:4
1991
Monograptus gerhardi — Jaeger, pp. 329, fig. 19-24; 28:9,11,13; 29:?,3,5/
1996
Colongraptus? gerhardi (Kühne) — Gutierrez-Marco et al., fig. 1:20-22
1996
Colongraptus gerhardi (Kühne) — Lenz et al., pp. 1396, fig. 4T,U
1998
Colongraptus gerhardi (Kühne) — Kozlowska-Dawidziuk et al., fig. 1:O,P
2001
Colongraptus gerhardi (Kühne, 1955) — Kozlowska-Dawidziuk et al., pp. 161, fig. 8.14-8.17; 9.4,9.5,9.14