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HealthyCounted ratings come from accounts older than 7 days and were made on or after publication. Finished readers weigh ×1.0. Readers who have not finished yet weigh ×0.5. Did-not-finish ratings are shown but not counted.
Editions
2 editions- Other · English · 1985Avon Books (Mm) · 9780380014262
- Other · English · 1968Basic Books Inc.,U.S. · 9780465050956
Thought and thinkingCreative thinkingProblem solvingLateral thinkingCreativiteitProbleemoplossing
