On Writing Well by William Zinsser (http://www.amazon.com/Writing-Well-30th-Anniversary-Edition/...) is fantastic. It's not specifically about ad copy, having passion about what you're writing, as well as the fundamentals in this book, will help a ton.
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On Writing Well by William Zinsser (http://www.amazon.com/Writing-Well-30th-Anniversary-Edition/...) is fantastic. It's not specifically about ad copy, having passion about what you're writing, as well as the fundamentals in this book, will help a ton.