Is Google Scholar a useful source? - PSYC 261 - Research Methods in Psychology - Research & Subject Guides at CSU, Chico: "While google Scholar may have its uses, overall it has enough problems to outweigh any benefits. As a result, most professors ask that you avoid it.
When it was released in November of 2004, google Scholar had huge gaps in the amount of scholarly literature it coverered. Over the years those gaps have been addressed. As shown by scholarly articles that investigate Google Scholar (which do indeed exist), Google Scholar's across the board coverage of scholarly literature is now considerably better than it was in 2004 and 2005, but it still has gaps. Suzanne Mikki (2010) further notes an issue that has persisted in Google Scholar ever since its launch: that Google Scholar covers literature in the scientific disciplines better than it does other disciplines. That's not to say it is totally lacking in the social sciences or humanities, but it has a history of being less comprehensive in these areas than in the natural sciences.
Another issue is access to the full text of articles through google Scholar. This issue takes two forms: the multiple copies problem and the access link problem."
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