https://epcostello.net/articles/2004/05/blocking_referer_spam.html
ed costello: articles and essays: Blocking Referer Spam
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https://oci.wordpress.org/plugins/tags/referer-spam/
Plugins categorized as referer spam | WordPress.org Occitan
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https://blogging.nitecruzr.net/2011/02/referer-spam-is-needlessly-alarming.html?showComment=1351020770688
Referer Spam Is Needlessly Alarming Blog Owners
What Blogger won't (or can't) tell you. Blogger features and problems explained, using real life examples.
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https://blogging.nitecruzr.net/2015/06/subtle-referer-spam-attacks-can-last.html
Subtle Referer Spam Attacks Can Last For Years
Some referer spam attacks, conducted at low volume, can remain undetected for months or years. Learn about the effects.
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https://lug.wordpress.org/plugins/tags/referer-spam/
Plugins categorized as referer spam | WordPress.org Oluganda
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https://blogging.nitecruzr.net/2011/02/referer-spam-is-needlessly-alarming.html?showComment=1310609421947
Referer Spam Is Needlessly Alarming Blog Owners
What Blogger won't (or can't) tell you. Blogger features and problems explained, using real life examples.
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https://hat.wordpress.org/plugins/tags/referer-spam/
Plugins categorized as referer spam | WordPress.org Haitian Creole
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https://mikeschnoor.com/tag/referer-spam/
Referer Spam Archive - Mike Schnoor
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