From the reviews:
This volume is based on symposia held in 2002 and 2004, which focused on aspects of gibbon behavior, ecology, conservation, and biogeography, plus analyses of their fossil record and interspecific evolutionary relationships. ... it is wonderful to see the range of colleagues from countries 'hosting' gibbons, fully engaged in their study. Summing Up: Recommended. Academic audiences, upper-division undergraduates and above. (E. Delson, Choice, Vol. 47 (3), November, 2009)
This well-written and insightful edited volume is based on symposia from the 2002 and 2004 International Primatological Society Congresses. Its editors accurately argue that gibbons have not received as much attention as great apes. ... By providing the most up-to-date review of hylobatid biogeography, dietary ecology, social organization, and conservation, this volume does an outstanding job in significantly adding to our knowledge of small apes. (Herbert H. Covert, American Journal of Physical Anthropology, Vol. 143, 2010)