In November 2004 Google scholar was officially launched, and made searching scholarly literature such as peer-reviewed papers, theses, books, preprints, abstracts and technical reports accessible to the public.
newspaper article
Benn, Oliver. “Worthy Adversary; Google Scholar gives Westlaw, Lexis a run for their money; Tools of the Trade.” The Recorder 8 March 2010
magazine article
Young J. “Google Unveils a Search Engine Focused on Scholarly Materials.” Chronicle Of Higher Education December 3, 2004: pA34-A34 . print.
journal article
Mayr, Philipp, and Anne-Kathrin Walter. “An exploratory study of Google Scholar.” Online Information Review 31.6 (2007): 814-30. Library Lit & Inf Full Text. Web. 14 Nov. 2011.
book
Miller, William, and Rita M. Pellen. Google Scholar and More: New Google Applications and Tools for Libraries and Library Users. London: Routledge, 2009. Print.