Franklin

MLA

Abt, Franz. Twenty-four Duets for Soprano and Contralto. London: Novello, Ewer & Co. , 189.

APA

Abt, F. (189). Twenty-four duets for soprano and contralto. London: Novello, Ewer & Co. .

Chicago

Abt, Franz, Twenty-Four Duets for Soprano and Contralto. London: Novello, Ewer & Co., 189.