Wells, M.J.; Wells, J. (1977). Cephalopoda: Octopoda, in: Giese, A.C. et al.Reproduction of marine invertebrates: IV. Molluscs: Gastropods and Cephalopods. pp. 291-336
In: Giese, A.C.; Pearse, J.S. (Ed.) (1977). Reproduction of marine invertebrates: IV. Molluscs: Gastropods and Cephalopods. Academic Press: New York. ISBN 0-12-282504-7. xii, 369 pp. https://dx.doi.org/10.1016/B978-0-12-282504-0.X5001-X, more
