Pudney, J. & Callard, G.V. (1986)
Sertoli cell cytoplasts in the semen of the spiny dogfish Squalus acanthias. Tissue and Cell, 18(3), 375–382
DOI: 10.1016/0040-8166(86)90057-1

Pudney, J. & Callard, G.V. (1984)
Development of agranular reticulum in Sertoli cells of the testis of the dogfish Squalus acanthias during spermatogenesis. The Anatomical Record, 209(3), 311–321
DOI: 10.1002/ar.1092090309

Pudney, J. & Callard, G.V. (1984)
Identification of Leydig-like cells in the testis of the dogfish Squalus acanthias. The Anatomical Record, 209(3), 323–330
DOI: 10.1002/ar.1092090310