obligations
| Author(s) | Title | Reference | |
|---|---|---|---|
| Dennis Green | Studien zum Ruodlieb. Ritterideal, Erzählstruktur und Darstellungsstil, by W. Braun | 32/1, p. 53 | |
| N. Denholm-Young | Liberties and Communities in mediæval England, by Helen M. Cam | 14/, p. 78 | |
| J.R.L. Highfield | The Lordship of Canterbury, by F. R. H. du Boulay | 37/1, p. 111 |