- ARKive.org: Geoffroy's Marmoset (Callithrix geoffroyi)
- Provides facts and status, description, range and habitat, biology, threats and conservation, and related species.
- Geoffroy's Tufted-ear Marmoset (Callithrix geoffroyi)
- The Primata explores morphology, range, ecology, locomotion, social behavior, communication, and reproduction.
- Geoffroy's Tufted-eared Marmoset (Callithrix geoffroyi)
- Highlights from National Zoo give classification, description, size, distribution, status, habitat, diets, reproduction, lifespan, behavior, and fun facts.
- Geoffroy's Tufted-eared Marmoset, White-fronted Marmoset (Callithrix geoffroyi)
- Overview, statistics, description, distribution, habitat, diet, behavior, reproduction, and conservation status from BBC Nature Threatened Species.
- Saint Louis Zoo: Geoffroy's Marmoset
- Furnishes images and information about Species Survival Plan, zoo exhibit, distribution and habitat, scientific name, characteristics, family groups, and trivia.
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