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. 31 (1): 31–38. Bibcode:2004MolPE..31...31K. doi:10.1016/j.ympev.2003.07.007. PMID15019606.
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. 31 (1): 31–38. Bibcode:2004MolPE..31...31K. doi:10.1016/j.ympev.2003.07.007. PMID15019606.
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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. 31 (1): 31–38. Bibcode:2004MolPE..31...31K. doi:10.1016/j.ympev.2003.07.007. PMID15019606.