| Verfasser | Häufigkeit |
| O'Callaghan Muñoz, Xavier |
31 |
| O'Callaghan, Michelle |
9 |
| Griffiths, Martin 1961- |
5 |
| O'Callaghan, Terry 1956- |
5 |
| Andréosso-O'Callaghan, Bernadette 1959- |
4 |
| Laplana, Josep de C. 1943- |
4 |
| Palau-Ribes O'Callaghan, Mercedes |
4 |
| O'Callaghan, Michael J. |
3 |
| Coen, Franklin 1912-1990 |
2 |
| Gilmartin, Mary 1969- |
2 |
| Jaussaud, Jacques 1957- |
2 |
| Jones, Raymond F. 1915-1994 |
2 |
| Morrow, Jeff 1907-1993 |
2 |
| Mun, U-sik 1960- |
2 |
| Newman, Joseph M. 1909-2006 |
2 |
| O'Callaghan, Cian ca. 20./21. Jh |
2 |
| O'Callaghan, Edward G. 20. Jh |
2 |
| O'Callaghan, Marion |
2 |
| O'Callaghan, Miriam |
2 |
| Reason, Rex 1928-2015 |
2 |