Sheela Gowda, Behold, 2009. Human hair and car bumpers (dimensions
variable). Installation view, Tate Modern, 2016. Acquisition number T14118.
Source: fry_theonly, Flickr (edited). Licence.

Summon is usually the best starting point for finding articles, books and dissertations. 

• video intro to Summon (4 mins) 
• collection of guides if you need help with particular Summon searches

You may also want to run supplementary searches in these databases:

• Art & Architecture Source
• Google Scholar: an alternative to Summon
  • info about using Scholar 
  • video intro to Scholar (3 mins)

For introductory articles:

• Grove Art Online: part of Oxford Art Online. In particular, the articles on countries give an overview of the history and art history of each. Also good introductions to major artists.  All articles include bibliographies.