| A new genealogical source in 'The Boston Pilot' | O'Ryan, William D. | Article in Journal | | 1967 |
| A short history and reference guide to Kilfeacle cemetery | Ryan, William | Monograph or Collective Volume | The author | 1985 |
| General W. A. C. Ryan, the Cuban martyr | O'Ryan, William D. | Article in Journal | | 1967 |
| Irish houses and castles | Guinness, DesmondRyan, William | Monograph or Collective Volume | Thames & Hudson | 1971 |
| Irish recipients of awards for bravery in the United States armed forces (1863-1963) | O'Ryan, William D. | Article in Journal | | 1968 |
| Lieutenant General Tomás O'Ryan y Vazquez | O'Ryan, William D. | Article in Journal | | 1963 |
| O'Ryan of Mallorca | O'Ryan, William D. | Article in Journal | | 1962 |
| The Irish labour movement : from the twenties to our own day | Ryan, William | Monograph or Collective Volume | Talbot Press | 1919 |
| The Pope's green island | Ryan, William | Monograph or Collective Volume | Nisbet | 1912 |