| Notes on Brögger's type species of agnostid trilobite genera |
| Bruton D.L. 1999: Notes on Brögger's type species of agnostid trilobite genera. GFF Vol. 121, pp. 337-341, Stockholm |
| Valenagnostus marginatus (BRØGGER 1878), Beschreibung Seite 341 - Abb. Fig. 4a-c |