2 literature references for Heteroteuthis dagamensis Robson, 1924:

Author: Sweeney, M. J. and C. F. E. Roper / N. A. Voss, M. Vecchione, R. B. Toll and M. J. Sweeney, eds.
Year: 1998
Title: Classification, type localities and type repositories of recent Cephalopoda
Source: Systematics and Biogeography of Cephalopods. Smithsonian Contributions to Zoology, 586 (I-II)
Author: Robson, G. C.
Year: 1924
Title: Preliminary report on the Cephalopoda (Decapoda) procured by the S.S. "Pickle"
Source: Report of the Fisheries and Marine Biological Survey of the Union of South Africa, 3