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Some things just grow during incremental edits and sometimes get out of hand. The "External links" section, one of the optional appendices, has grown to 9 entries. Three seems to be an acceptable number, and of course, everyone has their favorite to try to add for a fourth. Consensus needs to determine this.
ELpoints #3) states: Links in the "External links" section should be kept to a minimum. A lack of external links or a small number of external links is not a reason to add external links.
LINKFARM states: There is nothing wrong with adding one or more useful content-relevant links to the external links section of an article; however, excessive lists can dwarf articles and detract from the purpose of Wikipedia. On articles about topics with many fansites, for example, including a link to one major fansite may be appropriate.
ELCITE: Do not use {{cite web}} or other citation templates in the External links section. Citation templates are permitted in the Further reading section.
External links This page in a nutshell: External links in an article can be helpful to the reader, but they should be kept minimal, meritable, and directly relevant to the article. With rare exceptions, external links should not be used in the body of an article.
Second paragraph, acceptable external links include those that contain further research that is accurate and on-topic, information that could not be added to the article for reasons such as copyright or amount of detail, or other meaningful, relevant content that is not suitable for inclusion in an article for reasons unrelated to its accuracy.
Please also note:
WP:ELBURDEN: Disputed links should be excluded by default unless and until there is a consensus to include them. Please do not add back more than three or four links without consensus.