1. Describing relationships;RA Hinde;J Child Psychol Psychiatry Allied Discip,1976
2. Wilson EO. Communication: basic principles. Sociobiology The abridged editionthe Belknapp Press of Harvard University Press; 1980. p. 90–9.
3. Galinon-Mélénec B. Introduction. In: Communication et Développement des Hommes dEedT, editor. Homme / Animal: quelles relations? Quelles communications? Dieppe: Universités de Rouen et du Havre; 2003. p. 15–9.
4. An introduction to Umwelt;J Von Uexküll;Semiotica,2001
5. The evolution of communication;MD Hauser,1996