"Trad books" is a shortened term for traditional books. It refers to physical books made of paper and bound together, as opposed to digital or electronic versions. Full definition
Finally, one of the biggest advantages for trad books on Amazon is now available to self - publishers: pre-ordering. (selfpublishingreview.com)
Eric, It's not that the ratio of good to bad in indie books is the same as the ratio of good to bad in trad books, it's just that the good indie books rise to the top. (jakonrath.blogspot.ru)
«e-books are NOT currently cheaper then trad books, or at least, not initially; you have to buy a lot of new hardcovers to cover your $ 360 Kindle 2.0 purchase.» (blackplasticglasses.com)