Bigelow, H.B. & Schroeder, W.C. (1965)
A further account of batoid fishes from the western Atlantic. Bulletin of the Museum of Comparative Zoology at Harvard College, 132(5), 443–477

McEachran, J.D. & Compagno, L.J.V. (1982)
Interrelationships of and within Breviraja based on anatomical structures (Pisces: Rajoidei). Bulletin of Marine Science, 32(2), 399–425