Auditieve pianomethode voor kinderen van 5 tot 7 Jaar. Composed by Fransen de Jong. Sheet music. Method. MDS (Music Distribution Services) #BRP 1739. Published by MDS (Music Distribution Services) (M7.BRP-1739).
Piano Methodes en Etudes. Composed by Erna Fransen and Mieke de Jong. Method. Book Only. Composed 2015. Broekmans en Van Poppel #BVP1915. Published by Broekmans en Van Poppel (BT.BVP1915).