Bloomsbury 

Art journal databases are specialized - they're by authorities ("peer reviewed") and have special ways to get at art topics.

Art Abstracts/Art Index - the major journal article source for art.  Select either of the two databases and click the other (upper left selection) in order to search comprehensively from 1929

Artbibliographices Modern - just 19th-21st-century art.  Indexes down to essays in exhibition catalogs.  Multi-lingual.

Bibliography of the History of Art - Broadest coverage, before 1970's strong French coverage

Jstor - limit to "Art History" in area content

Frequently historic newspaper accounts can be primary sources for exhibitions and other reception documentation.  Also good for patronage verification and biographical/obituary accounts.  Both pdf scans of the actual column.

Times Digital Archive - the Times (London), 1785-1985

New York Times Digital Index - 1851 until three years ago.