| A teacher | A family member | Someone online | A book review | A character in another book |
| A song | A friend with similar reading taste to you | Someone ten years younger than you | A librarian | The cover art |
| Someone ten years older than you | A journalist | FREE SPACE (A book recommended by anyone) | A book club: Solaris by Stanislaw Lem | A list in a publication |
| A podcaster | Another author | The plot summary | A celebrity | A friend with very different reading taste from you |
| Someone you just met | A bookstore employee | A movie/TV show | SOMEONE but you can’t for the life of you remember who | A blurb on the cover |