Concentration ! : how to focus for success / Sam Horn
| Main Author: | Horn, Sam |
|---|---|
| Format: | MONOGRAPHS |
| Language: | English |
| Published: |
California : Crisp Pub., 1991 |
| Series: |
A fifty-minute series book
|
| Subjects: |
Attention.
Mental discipline. Success -- > Psychological aspects. |
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