Merlin and Vivian :
Op. 52, a lyric drama for chorus, soli and orchestra
Henry Hadley ; poem by Ethel Watts Mumford.

APA Citation

Hadley, H. Kimball., Grant, E. Watts Mumford. (1907). Merlin and Vivian: Op. 52, a lyric drama for chorus, soli and orchestra. New York: G. Schirmer.

MLA Citation

Hadley, Henry Kimball, 1871-1937, and Ethel Watts Mumford Grant. Merlin And Vivian: Op. 52, a Lyric Drama for Chorus, Soli And Orchestra. New York: G. Schirmer, 1907.

Warning: These citations may not always be complete (especially for serials).