APA (7th ed.) Citation

Gershwin, G., Heyward, D., Heyward, D., Gershwin, I., & Potts, B. (1935). It ain't necessarily so (Full score, [parts].). Sierra Music Publ.

Chicago Style (17th ed.) Citation

Gershwin, George, DuBose Heyward, Dorothy Heyward, Ira Gershwin, and Bill Potts. It Ain't Necessarily so. Full score, [parts]. Liberty Lake, WA: Sierra Music Publ, 1935.

MLA (9th ed.) Citation

Gershwin, George, et al. It Ain't Necessarily so. Full score, [parts]. Sierra Music Publ, 1935.