The Four Shelves: Petrova, Okafor, Moreau, and Vásquez

Four authors — Petrova, Okafor, Moreau, and Vásquez — each have exactly one genre and bookmark, and no two share any of them. Match each author to their genre and bookmark from these clues: 1. Vásquez is not the author whose book holds a pressed leaf. 2. Moreau is not the author whose book holds a pressed leaf. 3. Okafor is not the poet. 4. The science-fiction writer is the author whose book holds a pressed leaf. 5. Okafor is not the science-fiction writer. 6. Vásquez is not the poet. 7. The poet is the author whose book holds a ribbon bookmark. 8. Okafor is not the mystery writer. 9. The mystery writer is the author whose book holds a receipt.