Barry Callen





Barry Callen



Average rating: 3.68 · 25 ratings · 2 reviews · 2 distinct works
Perfect Phrases for Sales a...

3.53 avg rating — 15 ratings — published 2007 — 3 editions
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Manager's Guide to Marketin...

3.90 avg rating — 10 ratings — published 2009 — 6 editions
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