ABT, F. Practical singing tutor for bass and baritone Op. 474. [s.n.].
Chicago Style (17th ed.) CitationABT, Franz. Practical Singing Tutor for Bass and Baritone Op. 474. [s.n.].
MLA (8th ed.) CitationABT, Franz. Practical Singing Tutor for Bass and Baritone Op. 474. [s.n.].
Warning: These citations may not always be 100% accurate.