This paper reviews and compares the relative usefulness of CINAHL®, Health and Psychosocial Instruments (HaPI), PsycINFO, PsycARTICLES, and MEDLINE via PubMed for searching the psychology-related literature. The authors also present information about Psyc-EXTRA, the American Psychological Association's newest database covering gray literature, with comments on its performance as a searchable database. A sample search is used to compare retrieval results, and show the extent and appropriateness of coverage for each resource.
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Arnold et al. (2006) studied this question.
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