Oriģināls: Schubert, Franz Peter. Schubert, Franz Peter. Impromptu No.4 version from St. Louis. 4 Impromptus. D.899. Piano solo.
Tulkojums: Klavieru solo. Galvenais notis. Impromptu No.3 version from Leipzig. Breitkopf. Art Publication Society, 1915.