Find here the 15 brightest star clusters you can see without any special equipment. Observing deep-sky objects is easier than you think!
How to spot the Hyades, the closest star cluster to Earth
Star Clusters
Open Clusters by the Season - Sky & Telescope - Sky & Telescope
How to View Beautiful Open Star Clusters Using Mobile Apps
Star cluster - Wikipedia
How to find the Pleiades star cluster - Quora
Discover a Dozen Clusters in the W - Sky & Telescope - Sky & Telescope
Globular clusters: the ancient behemoths
The Five Daughters of Atlas - The Hyades Star Cluster - Farmers' Almanac - Plan Your Day. Grow Your Life.
Star cluster - Wikipedia
What is the difference between open clusters and globular clusters?