Quick, Fast and Easy Web of Science

Web of Science, formerly known as Web of Knowledge, is a collection of interdisciplinary bibliographic citations that includes publications from the medical, scientific, and social sciences, as well as the humanities.

Neither is full, but Web of Science citation data is deemed more accurate and reproducible and is recognised as the standard by official organisations. Google Scholar citations include books, theses, and other reports, but may not include many earlier citations due to the absence of labelling of older files.