Concentration! : how to focus for success
| Main Author: | Horn, Sam |
|---|---|
| Published: |
Los Altos, Calif.:
Crisp Publications,
c1991.
|
| Series: |
The fifty-minutes series book
|
| Subjects: |
| Physical Description: |
iii, 92 p.: ill.; 26 cm. |
|---|---|
| ISBN: |
1560520736 ( pbk.) |