Authors	Year	Title
Nassichuk & Furnish	1965	Christioceras, a new Pennsylvanian ammonoid from the Canadian Arctic. Journal of Paleontology, 39 (4): 724-728, fig.1-2, tab.1; Tulsa,Oklahoma.
Nassichuk & Furnish	1970	Christioceras, an Artic Pennsylvanian ammonoid, discovered in West Texas. Journal of Paleontology, 44 (2): 399-401, fig.1-3.
Nassichuk	1975	Carboniferous ammonoids and stratigraphy in the Canadian Arctic Archipelago. Bulletin of the Geological Survey of Canada, 237: 1-240, fig.1-57, tab.1-33, pl.1-18; Ottawa.