Groves C.P; Wilson D.E. & Reeder D.M. (eds) 2005.
Mammal species of the world.
3rd ed, Baltimore: Johns Hopkins University Press, pp.
148–152.
ISBN 0-801-88221-4
Dunn, Terry at Smithsonian National Zoological Park
Groves C.P; Wilson D.E. & Reeder D.M. (eds) 2005. Mammal species of the world. 3rd ed, Baltimore: Johns Hopkins University Press, pp. 148–152. ISBN 0-801-88221-4
Dunn, Terry at Smithsonian National Zoological Park
Howler monkey