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♦ ¹Feeding ecology and abundance of two sympatric skates, the shortfin sand skate Psammobatis normani McEachran, and the smallthorn sand skate P. rudis Günther (Chondrichthyes, Rajidae), in the southwest Atlantic , Ezequiel Mabragaña and Diego A. Giberto, ICES J. Mar. Sci. (2007) 64 (5): 1017-1027
♦ ²Yick, Jonah L., Adam Barnett, and Sean R. Tracey. "The trophic ecology of two abundant mesopredators in south-east coastal waters of Tasmania, Australia." Marine Biology 159.6 (2012): 1183+. Academic OneFile. Web. 14 July 2014.