Permission Based E-mail Marketing
by Kim MacPherson

Permission Marketing : Turning Strangers Into Friends And Friends Into Customers
by Seth Godin

Advanced Email Marketing
by Jim Sterne

Email Marketing: Using Email to Reach Your Target Audience and Build Customer Relationships
by Jim Sterne and Anthony Priore

Email Marketing By the Numbers: How to Use the World's Greatest Marketing Tool to Take Any Organization to the Next Level
by Chris Baggott and Ali Sales

Lucrative List Building: How Everyday People Are Building Huge, Highly Profitable Opt-In Email Lists from Scratch to Make Millions Online
by Glen Hopkins

Total E-Mail Marketing
by Dave Chaffey

Poor Richard's E-mail Publishing
by Chris Pirillo

Marketing with Email: A Spam Free Guide to Increasing Sales, Building Loyalty, and Increasing Awareness
by Shannon Kinnard

Sign Me Up! A marketer's guide to creating email newsletters that build relationships and boost sales
by Matt Blumberg, Michael Mayor, Tami Monahan Forman and Stephanie A. Miller