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Wikipedia:Essays in a nutshell/Verifiability and reliable sources

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See also Wikipedia:Essay directory#Verifiability and sources
Essay In a nutshell Shortcuts Impact
1.5 sources A term that relates to the use of sources that cannot strictly be categorised as being either primary sources or secondary sources. WP:1.5 Low
Allowing forensic crime data If properly used, forensic crime data can be cited as a primary source. WP:FORENSIC
WP:CRIMEDATA
Articles with a single source If an article is based on only one source, there may be copyright, original research, and notability concerns. WP:ONESOURCE
WP:1R
Low
Assessing reliability There are a number of ways in which you, as a reader, can assess the reliability of a given article. WP:AREL Low
Attribution needed When perspectives and opinions in Wikipedia are asserted without stating whose they are, an [attribution needed] flag may be inserted.
Avoiding untrue text in articles Sources should not only be verifiable and reliable, but also "true," in the sense that they accurately represent current academic consensus. WP:TRUTHFUL
WP:UNTRUE
WP:NOTBORNYESTERDAY
Unranked
Baby and bathwater Reliable sources are not infallible. Unranked
Children's, adult new reader, and large print sources questionable on reliability Be sure of the reliability of sources that were created for children or adult new readers and of abridged large-print media. WP:CHILDRENSLIT
WP:CHILDRENLIT
WP:ADULTNEWREADER
WP:LARGEPRINT
WP:ABRIDGED
WP:ABRIDGEMENT
Citations on new phenomena Reliable sources on new subcultures may be difficult to come by. Low
Citation overkill When citing material in an article, it is better to cite a couple of great sources than a stack of decent or sub-par sources. WP:CITEKILL
WP:CITECLUTTER
WP:OVERCITE
WP:OVERREF
High
Don't teach the controversy (That doesn't mean what you think it means.) Instead, neutrally document the conflict. WP:DTTC
WP:NDTC
Fruit of the poisonous tree If an otherwise reliable source attributes information to an unreliable source then that information is likewise unreliable. WP:FOTPT
WP:FRUIT
WP:POISON
WP:POISONOUSFRUIT
Law sources as reliable sources Some law sources may not be reliable. Others may be very complicated to use. WP:LAWSOURCES
WP:LAWSOURCE
WP:LAWBOOKS
WP:LAWBOOK
Tertiary-source fallacy Dictionaries, encyclopedias, and style guides do not magically trump other sources, policy, and reasoning. WP:TSF
What SYNTH is not Although avoiding original research is an important part of ensuring that Wikipedia content is verifiable, use some common sense about it, and particularly about asserting original research by synthesis. WP:SYNTHNOT Low
Writing about breeds A crash course (mostly for new editors) in how to write encyclopedically about animal breeds and related topics. WP:BREEDTIPS
You don't need to cite that the sky is blue Although citing sources is an important part of editing Wikipedia, do not cite already obvious information. WP:FACTS
WP:BLUE
Low