Suggested reading
Here are some books you can refer to for further information.
Coming Back
Life Comes from Life
Bhagavad-gita As It Is
Twenty Cases Suggestive of Reincarnation
Children who Remember Previous Lives
Cases of the Reincarnation Type
Where Reincarnation and Biology Intersect
Reincarnation and Biology: A Contribution to the Etiology of Birthmarks and Birth Defects