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Other reliable sources include university textbooks, books published by respected publishing houses, magazines, journals, and news coverage (not opinions) from mainstream newspapers. Self-published media, where the author and publisher are the same, are usually not acceptable as sources. These can include newsletters, personal websites, press ...
The relationship between the author and the publisher is the key point. If it's the same person (or the same group of people) doing both, then it's self-published. If it's a different person or group of people voluntarily deciding whether to make the authors' works available to the public, then it's non-self-published.
Other reliable sources include university textbooks, books published by respected publishing houses, magazines, journals, and news coverage (not opinions) from mainstream newspapers. Self-published media, where the author and publisher are the same, are usually not acceptable as sources. These can include newsletters, personal websites, press ...
The publication (for example, the newspaper, journal, magazine: "That source covers the arts.") and publications like them ("A newspaper is not a reliable source for medical claims"). The publisher of the work (for example, Cambridge University Press: "That source publishes reference works.") and publishers like them ("An academic publisher is ...
The usual Wikipedia quality control method of performing WP:Verification and checking for Wikipedia:Identifying and using independent sources may not apply to key information, because key information may only exist as the product of original research or self-published sources. A common use of key information in Wikipedia is a statement of a ...
However, if an author is an established expert with a previous record of third-party publications on a topic, their self-published work may be considered reliable for that particular topic. Whether a source is usable also depends on context. Sources that are reliable for some material are not reliable for other material.
The diary will reflect the prejudices of its author, and its author might be unaware of relevant facts. The book and the journal article are secondary sources. These secondary sources have advantages: The authors were not involved in the event, so they have the emotional distance that allows them to analyze the events dispassionately.
For example, if you request a copy of an unpublished book, and the author sends you a copy, the book is still considered unpublished. The book remains unpublished even if the author offers to supply copies to other Wikipedians. To be considered published, the book must be distributed to the public in general, not to individuals.