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4. Kemp AC (1994) Family Sagittariidae (Secretarybird). In: del Hoyo J, Elliott A, Sargatal J, editors. Handbook of the birds of the world. Vol 2. New World vultures to guineafowl. Lynx Edicions: Barcelona. pp. 206–215.
5. Boshoff AF, Allan DG (1997) Secretarybird Sagittarius serpentarius. In: Harrison JA, Allan DG, Underhill LG, Herremans M, Tree AJ, et al.., editors. The atlas of southern African birds. Vol. 1: Non-passerines. BirdLife South Africa: Johannesburg. pp. 152–153.