Concentration! : how to focus for success /
Horn, Sam.
Concentration! : how to focus for success / Sam Horn. - Los Altos, Calif. : Crisp Publications, c1991. - iii, 92 p. : ill. ; 26 cm.
1560520736
Attention.
Mental discipline.
Success--Psychological aspects.
BF637.S8 / H615 1991
Concentration! : how to focus for success / Sam Horn. - Los Altos, Calif. : Crisp Publications, c1991. - iii, 92 p. : ill. ; 26 cm.
1560520736
Attention.
Mental discipline.
Success--Psychological aspects.
BF637.S8 / H615 1991
