1. Spontaneous and evoked vocalization in the White-handed Gibbon Hylobates lar (Pongidae);Apfelbach;Am. Zoologist,1970
2. A field study of the behavior and social relations in the Gibbon (Hylobates lar);Carpenter;Comp. Psychol. Monogr.,1940
3. Notes on a family of greeting gibbons;Coolidge;Human Biology,1933