The universe contains a vast amount of stars, and estimating their number requires knowing the number of galaxies in the universe.
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Reference World Atlas
10 Shocking Facts About the Night Sky
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My Big Book of Answers World Atlas, Book by Little Genius Books, Official Publisher Page
The State of the World Atlas by Dan Smith
World Atlas Sticker Activity Book - By National Geographic Kids (paperback) : Target
The Oldest Star In The Universe - WorldAtlas
Beginner's World Atlas, 5th Edition - Montessori Services
Webster's World Atlas And Almanac Travel Size Color Maps Fold Out HB 1987 Stars 9780517474136