1. The assessment and management of pain in children;Beales,1982
2. Developmental changes in infant pain expression during immunization injections;Craig;Soc. Sci. Med.,1984
3. The Expression of Emotion in Man and Animals;Darwin,1965
4. Pain: a Sourcebook for Nurses and Other Health Professionals;Eland,1977
5. Statistical Analysis in Psychology and Education;Ferguson,1966