Yochelson, E. L.; Flower, R. H.; Webers, G. F. (1973), "The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda", Lethaia, 6 (3): 275–309, Bibcode:1973Letha...6..275Y, doi:10.1111/j.1502-3931.1973.tb01199.x
Yochelson, E. L.; Flower, R. H.; Webers, G. F. (1973), "The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda", Lethaia, 6 (3): 275–309, Bibcode:1973Letha...6..275Y, doi:10.1111/j.1502-3931.1973.tb01199.x