Crabb, George (1823). "BRADYPUS". Universal Technological Dictionary Or Familiar Explanation of the Terms Used in All Arts and Sciences: Containing Definitions Drawn from the Original Writers : in Two Volumes. Vol. I. Baldwin, Cradock & Joy. p. 262. Archived from the original on 12 April 2017.
Gompper, Matthew E.; Decker, Denise M. (1 June 1998). "Mammalian species: Nasua nasua"(PDF). American Society of Mammalologists. Archived(PDF) from the original on 15 March 2016.
Crabb, George (1823). "BRADYPUS". Universal Technological Dictionary Or Familiar Explanation of the Terms Used in All Arts and Sciences: Containing Definitions Drawn from the Original Writers : in Two Volumes. Vol. I. Baldwin, Cradock & Joy. p. 262. Archived from the original on 12 April 2017.
Gompper, Matthew E.; Decker, Denise M. (1 June 1998). "Mammalian species: Nasua nasua"(PDF). American Society of Mammalologists. Archived(PDF) from the original on 15 March 2016.