| 100% | ENGELS | 6 | Marx co-author |
| 78% | ENGELS | 6 | "Communist Manifesto" co-author with Marx |
| 75% | ENGELS | 6 | Marx's co-author for "The Communist Manifesto" |
| 72% | ENGELS | 6 | Friedrich —, co-author with Karl Marx of The Communist Manifesto |
| 68% | ENGELS | 6 | Friedrich —, co-author with Karl Marx of 1848's The Communist Manifesto |
| 63% | KARL | 4 | "Das Kapital" author Marx |
| 61% | KARL | 4 | Marx who co-wrote "The Communist Manifesto" |
| 54% | ERICHSEGAL | 10 | Author who co-wrote the screenplay for the Beatles' "Yellow Submarine" |
| 54% | GIDE | 4 | French author who co-founded La Nouvelle Revue Française |
| 52% | BARRYMORE | 9 | Drew __, author of Wildflower and co-star on E.T. |
| 52% | HODA | 4 | “Today” co-anchor Kotb, author of “You Are My Happy” |
| 51% | ENGELS | 6 | Co-author of "The Communist Manifesto" |
| 51% | JOETORRE | 8 | Co-author of "The Yankee Years" |
| 51% | MARX | 4 | Co-author of "The Communist Manifesto" |
| 51% | JOHNJAY | 7 | Co-author of the Federalist Papers |
| 51% | NEGRI | 5 | Co-author of “Empire,” with Hardt |
| 51% | REYS | 4 | Co-authors Margret and H. A. |
| 51% | ENGELS | 6 | "Communist Manifesto" co-author |
| 51% | IVINS | 5 | "Bushwhacked" co-author Molly |
| 51% | REYS | 4 | "Curious George" co-authors |
| 50% | ALANMOORE | 9 | Co-author with Dave Gibbons of Watchmen |
| 49% | JOETORRE | 8 | "The Yankee Years" co-author |
| 49% | ENGELS | 6 | "The Communist Manifesto" co-author |
| 49% | MADISON | 7 | "The Federalist Papers" co-author |
| 49% | REY | 3 | "Curious George" co-author Margret |
| 49% | DUBNER | 6 | Stephen J. __, co-authored Freakonomics |
| 49% | ETAL | 4 | Abbr. representing unlisted co-authors |
| 49% | ETAL | 4 | Shorthand for unnamed co-authors |
| 48% | POHL | 4 | Co-author of stories with Asimov and Clarke |
| 48% | NESS | 4 | Co-author of the 1957 memoir "The Untouchables" |