Input (grade 10): Stevenson's research was the subject of Tom Shroder's Old Souls: The Scientific Evidence for Past Lives (/O1999/O) and Jim B. Tucker's Life Before Life: A Scientific Investigation of Children's Memories of Previous Lives (/O2005/O).
Output (grade 4): Stevensons research was the subject of Jim B. Tuckers Life Before Life (/O2005/O).