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♦ ¹THE DIET OF HARBOUR PORPOISE (PHOCOENA PHOCOENA) IN THE NORTHEAST ATLANTIC, M. B. SANTOS & G. J. PIERCE, Oceanography and Marine Biology: an Annual Review 2003, 41, 355–390
♦ ²DIET AND FEEDING BEHAVIOR OF FIN AND BRYDE'S WHALES IN THE CENTRAL GULF OF CALIFORNIA, MEXICO, Bernie R. Tershy, Alejandro Acevedo-G., Dawn Breese and Craig S. Strong, Rev. Inv. Cient. Vol. 1, UABCS, 1993