| 01 | The Oxford English Dictionary | 66.2 |
| 02 | The Elements of Style | 43.0 |
| 03 | The Timetables of History | 33.4 |
| 04 | Roget’s International Thesaurus | 32.7 |
| 05 | A dictionary | 30.0 |
| 06 | Roget's Thesaurus | 27.8 |
| 07 | Encyclopaedia Britannica | 24.4 |
| 08 | The World Almanac and Book of Facts | 24.2 |
| 09 | The Joy of Cooking | 23.8 |
| 10 | Merriam-Webster Collegiate | 23.1 |
| 11 | A style/usage guide | 23.1 |
| 12 | Eshbach’s Handbook of Engineering Fundamentals | 22.5 |
| 13 | Brewer's Dictionary of Phrase and Fable | 21.9 |
| 14 | CRC Handbook of Chemistry and Physics | 20.3 |
| 15 | An encyclopedia | 20.3 |
| 16 | The Chicago Manual of Style | 20.3 |
| 17 | The Dictionary of the Book: A Glossary for Book Collectors | 19.2 |
| 18 | An atlas | 18.7 |
| 19 | AP Stylebook | 18.7 |
| 20 | A general science reference | 17.7 |
| 21 | A practical manual for home/health/cooking | 16.9 |
| 22 | Garner’s Modern English Usage | 15.8 |
| 23 | libraryjournal.com | 15.6 |
| 24 | Woe Is I | 15.4 |
| 25 | English Grammar in Use | 15.0 |
| 26 | Gale Encyclopedia of Neurological Disorders | 14.7 |
| 27 | Schaum’s Outline | 14.4 |
| 28 | librarything.com | 14.1 |
| 29 | Historical Dictionary of Baroque Music | 14.1 |
| 30 | How to Cook Everything | 14.0 |