APA

Sonneck O., . (19). Early opera in America. NEWYORK: B. Blom.

Chicago

Sonneck O.G, . 19. Early opera in America. NEWYORK: B. Blom.

Harvard

Sonneck O., . (19). Early opera in America. NEWYORK: B. Blom.

MLA

Sonneck O.G, . Early opera in America. NEWYORK: B. Blom. 19.