Why are four-leaf clovers so rare? - BBC Science Focus Magazine

Meet the Ecologist Who Wants You to Unleash the Wild on Your Backyard, Science

The Jewel Box by Tim Blackburn - Ebook

11 Lucky Facts About The Four-Leaf Clover - The Fact Site

PREVIEWS - Gift Focus magazine

How to press flowers - Gathered

A Comparative Analysis of Four-Leaf Clover Induced Luck - Journal of Astrological Big Data Ecology

The Science of the Shamrock

What are the odds? Woman finds 21 four-leaf clovers in her front yard

Wisconsin Woman Breaks World Record Most 4-Leaf Clovers Collected