synchronic
| Author(s) | Title | Reference | |
|---|---|---|---|
| A.D. Wilshere | Old French: A Concise Handbook, by E. Einhorn | 46/1, p. 117 | |
| ALAN WARD | Old English Phonology, by Roger Lass, John M. Anderson | 48/2, p. 272 | |
| JAN ČERMÁK | A Grammar of Old English, Vol. I: Phonology, by Richard M. Hogg | 62/2, p. 312 |