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Efe, Márcio Amorim (2008). "Fregata ariel (Gray, 1845)"(PDF). Livro vermelho da fauna brasileira ameaçada de extinção Volume 2 (in Portuguese). Brasília: Ministério do Meio Ambiente. pp. 410–411. ISBN978-85-7738-102-9. Archived from the original(PDF) on 2014-12-11. Retrieved 2014-12-02.
Olson, Storrs L. (2017). "Species rank for the critically endangered Atlantic Lesser Frigatebird (Fregata trinitatis)". Wilson Journal of Ornithology. 129 (4): 661–674. doi:10.1676/1559-4491-129.4.661. S2CID91072996.
Efe, Márcio Amorim (2008). "Fregata ariel (Gray, 1845)"(PDF). Livro vermelho da fauna brasileira ameaçada de extinção Volume 2 (in Portuguese). Brasília: Ministério do Meio Ambiente. pp. 410–411. ISBN978-85-7738-102-9. Archived from the original(PDF) on 2014-12-11. Retrieved 2014-12-02.