Google the sentence "It was the best of times, it was the worst of times" and list the five top sources
The five top sources for the sentence "It was the best of times, it was the worst of times" are: 
1. Charles Dickens: A Tale of Two Cities (book) 
2. Charles Dickens: A Tale of Two Cities (film) 
3. Chang Chun Wei: Let the Best Time Begin (song) 
4. Victor Hugo: Les Misérables (book) 
5. Victor Hugo: Les Misérables (film)
1. A Tale of Two Cities by Charles Dickens
2. Les Misérables by Victor Hugo
3. The Autobiography of Malcolm X by Malcolm X
4. The Great Gatsby by F. Scott Fitzgerald
5. The Old Curiosity Shop by Charles Dickens