TY  - BOOK
AU  - Horn,Sam
TI  - Concentration!: how to focus for success 
SN  - 1560520736
AV  - BF637.S8 H615 1991
PY  - 1991///
CY  - Los Altos, Calif.
PB  - Crisp Publications
KW  - Attention
KW  - Mental discipline
KW  - Success
KW  - Psychological aspects
ER  -