Standard & Poor's NetAdvantage
From the dropdown menu on the right side, choose the appropriate industry guide: Publishing.

RDS Business Reference Suite
Choose "publishing" from the Industry dropdown menu and type in keywords to retrieve articles. Check the TABLEBASE results for market share and other rankings.

Investext
Try typing in "publishing" and "industry report" into the keyword box. Also, type in the name of a public company into the company box and the term "initiating" into the keywords in order to retrieve more substantial reports