WH Smith asked its followers on social media customers their favourite paperbacks of all time.
It compiled a list of 100 from the thousands of suggestions.
Here is the top 20:
1. To Kill A Mockingbird - Harper Lee
2. The Book Thief - Markus Zusak
3. The Lord of the Rings - JRR Tolkien
4. Pride and Prejudice - Jane Austen
5. The Catcher in the Rye - JD Salinger
6. Harry Potter and the Philosopher's Stone - JK Rowling
7. The Kite Runner - Khaled Hosseini
8. The Great Gatsby - F Scott Fitzgerald
9. Rebecca - Daphne Du Maurier
10. Gone Girl - Gillian Flynn
11. The Fault in Our Stars - John Green
12. Birdsong - Sebastian Faulks
13. Lord of the Flies - William Golding
14. Life of Pi - Yann Martel
15. The Hunger Games - Suzanne Collins
16. Me Before You - Jojo Moyes
17. One Day - David Nicholls
18. The Curious Incident of the Dog in the Night-Time - Mark Haddon
19. 1984 - George Orwell
20. Jane Eyre - Charlotte Bronte
You can see the full 100 here.