Any DSLR camera, or SLT camera, or virtually any mirrorless camera (all APS-C sensors, and M4:3 sensors) are capable of meeting publication standards for books and periodicals. Even P&S cameras, if the shot was well exposed, resolution is sufficient, and the lighting was good, can meet publication standards, depending on the print size that will be needed.
Do not worry about which camera body, nor which camera brand. It's more about the lenses which will help get the shot needed, and more than anything, the photographer who is responsible for doing the metering & composition to deliver the worthy photograph.
I have been publishing photos for 9 years now, from local periodicals to national periodicals and books, starting with a prosumer P&S camera in 2004, a superzoom in 2006, DSLRs (entry-level and mid-level) since 2008, and mirrorless cameras (APS-C) since 2011. The camera hasn't mattered - whether or not I nailed the shot and had the right settings, and did the appropriate post-processing without overprocessing, were all that mattered.