Kennedy, Martyn; Spencer, Hamish G (2004). «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). pp. 31–38. PMID15019606. doi:10.1016/j.ympev.2003.07.007
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hbw.com
Orta, J; Christie, DA; Garcia, EFJ; Jutglar, F; Boesman, P. «Ascension Frigatebird (Fregata aquila)». In: del Hoyo, J; Elliott, A; Sargatal, J; Christie, DA; de Juana, E. Handbook of the Birds of the World Alive. Barcelona: Lynx Edicions
Kennedy, Martyn; Spencer, Hamish G (2004). «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). pp. 31–38. PMID15019606. doi:10.1016/j.ympev.2003.07.007