- Roeder 1994
- Yawning in ringtailed lemurs (Lemur catta). Pp. 77-80 in Current Primatology, Vol H: Social Development, Learning and Behaviour. Ill. Roeder, B. Thierry, l.R. Anderson, and N. Herrenschmidt. eds. Strasbourg, University of Louis Pasteur. (ISBN 2-907531 - 01 -8)