APA (7th ed.) Citation

Library of Congress. Music Division. (1914). Catalogue of opera librettos printed before 1800: Volume II. Author list, composer list and aria index. GPO.

Chicago Style (17th ed.) Citation

Library of Congress. Music Division. Catalogue of Opera Librettos Printed Before 1800: Volume II. Author List, Composer List and Aria Index. [Washington]: GPO, 1914.

MLA (9th ed.) Citation

Library of Congress. Music Division. Catalogue of Opera Librettos Printed Before 1800: Volume II. Author List, Composer List and Aria Index. GPO, 1914.