1. Biographical notes on some famous conjoined twins;Guttmacher;Birth Defects Original Article Series,1967
2. Ethical and moral considerations in the separation of conjoined twins;Pepper;Birth Defects Original Article Series,1967
3. The simultaneous analysis of a pair of identical twins and the twinning reaction;Joseph,1961
4. Growth and crises of the healthy personality;Erikson;Psychological Issues,1959
5. Psychological appraisal of conjoined twins;Cleveland;Journal of Projective Techniques and Personlaity Assessment,1964