Thomas R. Alley 
Social and Applied Aspects of Perceiving Faces [PDF ebook] 

This interdisciplinary overview integrates a variety of perspectives on the process and interpretation of faces as a major source of verbal and nonverbal communication. Written by authors from social, experimental, and cognitive psychology as well as from the dental sciences, Social and Applied Aspects of Perceiving Faces covers topics including normal variation in facial appearance and facial anomalies.