Gershwin, G., & Gershwin, I. (1964). What causes that? Alfred Publishing Co., Inc..
Lua i Stíl Chicago (17ú heag.)Gershwin, George, agus Ira Gershwin. What Causes That? Louisville, United States: Alfred Publishing Co., Inc., 1964.
Lua MLA (9ú heag.)Gershwin, George, agus Ira Gershwin. What Causes That? Alfred Publishing Co., Inc., 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.