Book 6. 5 Late Intermediate Pieces for One Piano, Four Hands. Duet or Duo; Piano Duet (1 Piano, 4 Hands); Solo Small Ensembles. Grand Duets for Piano. Children. Book. 40 pages. Alfred Music #00-37115. Published by Alfred Music (AP.37115).
Book 6. Correlated Standard Repertoire. Edited by E. L. Lancaster and Gayle Kowalchyk. Masterworks; Method/Instruction; Piano – Alfred’s Premier Piano Course. Premier Piano Course. Masterwork. Book and CD. 40 pages. Alfred Music #00-40516. Published by Alfred Music (AP.40516).
Book 6. Edited by Gayle Kowalchyk and E. L. Lancaster. Method/Instruction; Piano – Alfred’s Premier Piano Course. Premier Piano Course. Children; Recital. Book. 40 pages. Alfred Music #00-44626. Published by Alfred Music (AP.44626).