From the book '100 Best Business Books of All Time', comes this list of 11 all-time-best books on sales and marketing. Reading these books while running a small marketing campaign (of any kind) looks like a good way to learn the skill of marketing.
Sales and Marketing (books)
Approaches and pitfalls in the ongoing process of creating customers.
Influence by Robert B. Cialdini, PhD
Positioning by Al Ries and Jack Trout
A New Brand World by Scott Bedbury with Stephen Fenichell
Selling the Invisible by Harry Beckwith (also available in CD and audio)
Zag by Marty Neumeier
Crossing the Chasm by Geoffrey A. Moore
Secrets of Closing the Sale by Zig Ziglar (also available in CD and audio)
How to Become a Rainmaker by Jeffrey J. Fox (also available in CD and audio)
Why We Buy by Paco Underhill (also available in audio)
The Experience Economy by B. Joseph Pine II and James H. Gilmore (also available in audio)
Purple Cow by Seth Godin (also available in audio)
The Tipping Point by Malcolm Gladwell (also available in CD and audio)