TY  - BOOK
AU  - Claridge,Gordon
AU  - Canter,Sandra
AU  - Hume,W.I.(Wilfred Ian).
TI  - Personality differences and biological variations : : a study of twins 
SN  - 0080171249
PY  - 1973///
CY  - Oxford : 
PB  -  Pergamon Press, 
KW  - Twins
KW  - Individuality
KW  - Variation (Biology)
N1  - Index
ER  -