Guido
| Author(s) | Title | Reference | |
|---|---|---|---|
| Stanley B. Greenfield | THE ROLE OF CALKAS IN "TROILUS AND CRISEYDE" | 36/2, p. 141 |
| Author(s) | Title | Reference | |
|---|---|---|---|
| John Stevens | Hucbald, Guido, and John on Music: Three Medieval Treatises. (Music Theory Translation Series 3), by Warren Babb, Claude V. Palisca | 49/1, p. 99 |