Marshall, A. D., Pierce, S. J. and Bennett, M. B. (2008) “Morphological measurements of manta rays (Manta birostris) with a description of a foetus from the east coast of Southern Africa”, Zootaxa. Auckland, New Zealand, 1717(1), pp. 24–30. doi: 10.11646/zootaxa.1717.1.2.