
- Universal Principles of Design, Revised and Updated: 125 Ways to Enhance Usability, Influence Perception, Increase Appeal, Make
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From $20.49 (New)

From $20.49 (New)

| Latest | $20.49 1 hr ago |
| Highest | $20.49 Apr 18, '16 |
| Lowest | $14.84 Sep 10, '15 |
| Average | $17.73 (30d avg) $16.95 (90d avg) $16.64 (180d avg) $16.32 (365d avg) $17.77 (Lifetime average) |
| Added | Apr 15, 2013 |
| Latest | $12.28 1 hr ago |
| Highest | $19.95 Jan 1, '14 |
| Lowest | $5.99 Jan 24, '16 |
| Average | $11.69 (30d avg) $12.38 (90d avg) $13.29 (180d avg) $13.61 (365d avg) $15.25 (Lifetime average) |
| Added | Apr 15, 2013 |
| Latest | $11.00 1 hr ago |
| Highest | $17.00 Sep 9, '15 |
| Lowest | $4.08 Dec 9, '14 |
| Average | $10.47 (30d avg) $9.93 (90d avg) $10.52 (180d avg) $10.96 (365d avg) $12.11 (Lifetime average) |
| Added | Apr 15, 2013 |
30 day average: 10,692
90 day average: 10,220