Based on the provided text, here are the 19 books mentioned in the Guardian's "This Month's Best Paperbacks" section:
1. **The Loves of My Life** by Edmund White - Memoir
2. **Perspectives** by Laurent Binet - Fiction
3. **This Is Not a Game** by Kelly Mullen - Crime
4. **The Bright Side** by Sumit Paul-Choudhury - Psychology
5. **The Ghosts Of Rome** by Joseph O'Connor - Fiction
6. **A Boy's Own Story** by Edmund White (mentioned as one of the author's semi-autobiographical novels)
7. **Hello Kitty** by Jean Genet (mentioned in the context of cultural references)
8. **Sontag** by Jean Genet (mentioned in the context of cultural references)
9. **The Life of Brian** by Eric Idle (mentioned as a possible influence on the book's tone)
10. **Stendhal** by Stendhal (mentioned in the context of literary references)
11. **Aids crisis** - discussed in Edmund White's memoir
12. **Murderscape** - video game mentioned as a source of inspiration for Addie, one of the main characters in Kelly Mullen's novel
13. **The Choir** by Joseph O'Connor (mentioned as part of his Rome Escape Line trilogy)
14. **San Lorenzo** - church where Jacopo da Pontormo was murdered
15. **Jean Genet** - French writer and author mentioned multiple times in the context of literary references
16. **Stendhal** - French writer and author mentioned multiple times in the context of literary references
17. **Aids crisis** - discussed in Edmund White's memoir
18. **The Life of Brian** - musical by Eric Idle (mentioned as a possible influence on the book's tone)
19. **Hello Kitty** - character from the 1970s Japanese toy and cartoon franchise mentioned in the context of cultural references
1. **The Loves of My Life** by Edmund White - Memoir
2. **Perspectives** by Laurent Binet - Fiction
3. **This Is Not a Game** by Kelly Mullen - Crime
4. **The Bright Side** by Sumit Paul-Choudhury - Psychology
5. **The Ghosts Of Rome** by Joseph O'Connor - Fiction
6. **A Boy's Own Story** by Edmund White (mentioned as one of the author's semi-autobiographical novels)
7. **Hello Kitty** by Jean Genet (mentioned in the context of cultural references)
8. **Sontag** by Jean Genet (mentioned in the context of cultural references)
9. **The Life of Brian** by Eric Idle (mentioned as a possible influence on the book's tone)
10. **Stendhal** by Stendhal (mentioned in the context of literary references)
11. **Aids crisis** - discussed in Edmund White's memoir
12. **Murderscape** - video game mentioned as a source of inspiration for Addie, one of the main characters in Kelly Mullen's novel
13. **The Choir** by Joseph O'Connor (mentioned as part of his Rome Escape Line trilogy)
14. **San Lorenzo** - church where Jacopo da Pontormo was murdered
15. **Jean Genet** - French writer and author mentioned multiple times in the context of literary references
16. **Stendhal** - French writer and author mentioned multiple times in the context of literary references
17. **Aids crisis** - discussed in Edmund White's memoir
18. **The Life of Brian** - musical by Eric Idle (mentioned as a possible influence on the book's tone)
19. **Hello Kitty** - character from the 1970s Japanese toy and cartoon franchise mentioned in the context of cultural references