www.intelltheory.com

Anchor text: Timeline of researchers and brief biographies

Wikipedia: Differential psychology

Wikipedia: Sibling

Anchor text: Human Intelligence: Raymond B. Cattell

Wikipedia: Raymond Cattell

Anchor text: Profile at Human Intelligence

Wikipedia: Leon Kamin

Wikipedia: Philip E. Vernon

Anchor text: Human Intelligence: Douglas K. Detterman

Wikipedia: Douglas K. Detterman

Anchor text: Human Intelligence: John B. Carrol

Wikipedia: Three-stratum theory

Anchor text: Carol Dweck

Wikipedia: Carol Dweck

Wikipedia: Leta Stetter Hollingworth

Wikipedia: Harry L. Hollingworth