Young R.E. & Roper C.F.E. (1969). A monograph of the Cephalopoda of the North Atlantic: the family Cycloteuthidae.. Smithsonian Contributions to Zoology 5: 1-24, 3 figures, 9 plates.
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Young, R. E.; Roper, C. F.
1969
A monograph of the Cephalopoda of the North Atlantic: the family Cycloteuthidae