Not a marketing book per se, but probably the book that has had the most profound effect on my marketing efforts (and the way I communicate in general) is Made

Not a marketing book per se, but probably the book that has had the most profound effect on my marketing efforts (and the way I communicate in general) is Made to Stick by Chip and Dan Heath. Another good book I'd recommend is Hot Button Marketing by Barry Feig. I've read quite a few others, but none that really jump out that would be a great read for someone who's not a marketing person.