Print - on - demand or e-only titles are only accepted for consideration if the item is readily available through standard library vendors (such as Baker & Taylor, Ingram, Overdrive, etc.). (booklistonline.com)
In cooperation with customers and partners, ProQuest is currently integrating EBL and ebrary to create an unparalleled ebook solution with the most choice in access models, the greatest content selection, and integration across many library vendors and services. (ingramcontent.com)
Then make sure you have your book accessible to vendors: libraries (public and school) buy for their collections from library suppliers and library vendor catalogues. (ingramspark.com)