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What is a Blue Moon? by Michael Myers

Folklore of the Blue Moon by Philip Hiscock

What's a Blue Moon? by Donald W. Olson, Richard T. Fienberg, and Roger W. Sinnott - Sky & Telescope

Once in a Blue Moon - What is a blue moon? by Ann-Marie Imbornoni

Topical Words - Blue Moon

Blue Moon: Folklore or fakelore? by Pip Wilson

A Blue Moon Calculator by David Harper

On Blue Moons by Kevin Clarke

Article arguing that a blue moon is the 3rd full moon in a season of 4 blue moons, not the 2nd in a month

Blue Moon by Irineu Gomes Varella (Portuguese)

What is a Blue Moon?

'Blue moon' coming to our skies soon