Hucbald, Guido, and John on music three medieval treatises - Hucbaldus de Sancto Amando 840-930; Guido von Arezzo 992-1050 (Yale Univ. Press, 1978)
Enth. u.a. 1.: Hucbaldus <de Sancto Amando>: Melodic instruction. Enth. u.a. 2.: Guido <Aretinus>: Micrologus