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Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required). The "Size" column denotes the number of documents (articles, publications, datasets, preprints) rather than the number of citations or references.
Prefer secondary sources – Articles should rely on secondary sources whenever possible. For example, a paper reviewing existing research, a review article, monograph, or textbook is often better than a primary research paper. When relying on primary sources, extreme caution is advised.
Research libraries will hold paper guides to authoritative sources. The most useful is The American Historical Association's Guide to Historical Literature, edited by Mary Beth Norton and Pamela Gerardi 2 vol (1995), which is an annotated bibliography of authoritative sources in all fields of history.
a list of banned sources that can never be used or should be removed on sight; a list of biased or unbiased sources; a list of sources that are guaranteed to be 100% correct regardless of context; a list of every source that has been discussed; a list of sources that have never been discussed, or whose reliability should be obvious to most editors
Inclusion on the list doesn't automatically mean the absolute truth is on these websites, so always be critical and compare information between different sources. The content of the subsections is alphabetically organized. Please add free online sources if you know some that are missing in this list, but try to keep it relevant and trustworthy.
This page in a nutshell: Cite reviews, don't write them. Appropriate sources for discussing the natural sciences include comprehensive reviews in independent, reliable published sources, such as recent peer reviewed articles in reputable scientific journals, statements and reports from reputable expert bodies, widely recognized standard textbooks written by experts in a field, or standard ...
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...
Most editors would assume that his book is a reliable source. But... from the book: "Screwball is a particularly apt term for a certain type of movie that, like the baseball pitch of the same name, travels a fast but unpredictable path before somehow managing to cross the plate for a perfect strike."