Kennedy, Martyn; Spencer, Hamish G. Phylogenies of the frigatebirds (Fregatidae) and tropicbirds (Phaethonidae), two divergent groups of the traditional order Pelecaniformes, inferred from mitochondrial DNA sequences. Molecular Phylogenetics and Evolution. 2004, 31 (1): 31–38. PMID 15019606. doi:10.1016/j.ympev.2003.07.007.
Corre, Matthieu Le; Cebc, Pierre Jouventin. Geographical variation in the White‐tailed Tropicbird Phaethon lepturus, with the description of a new subspecies endemic to Europa Island, southern Mozambique Channel. Ibis. 1999, 141 (2): 233–239. doi:10.1111/j.1474-919X.1999.tb07546.x.
Kennedy, Martyn; Spencer, Hamish G. Phylogenies of the frigatebirds (Fregatidae) and tropicbirds (Phaethonidae), two divergent groups of the traditional order Pelecaniformes, inferred from mitochondrial DNA sequences. Molecular Phylogenetics and Evolution. 2004, 31 (1): 31–38. PMID 15019606. doi:10.1016/j.ympev.2003.07.007.