- Primate Info Net: Primate Factsheets
- Baboon Tales: Study Guide (1998; PDF) (404 error)
- Help(ing) Hoolock Gibbons Hang On (Zoo Outreach Organisation, India; January 1, 2007)
- Inside the Animal Mind
- Is There a Difference Between Monkeys and Apes?
- Primates (McGraw-Hill Encyclopedia of Science and Technology, 2002)
- Primates (Conservation International) (404 error)
- San Diego Zoo: Absolutely Apes (Includes webcam)
- San Diego Zoo: Monkey
- Spider Monkey Conservation Project (A website supporting conservation of Ateles hybridus and the doctoral research of Diana Liz Duque Sandoval; 2012) (not available)
- The Primates: An Introduction to the Taxonomy and General Characteristics of the Living Primates (by Dr. Dennis O’Neil, Behavioral Sciences Department, Palomar College, San Marcos, California)
- What Are Primates? (Great Ape Trust of Iowa) (404 error)
- What Makes a Primate a Primate? (by Kathryn Orzech, University of Arizona)