Levine, L. S., & Norman, M. (1991). How Could I Ever Know? Alfred Publishing Co., Inc..
Lua i Stíl Chicago (17ú heag.)Levine, Lucy Simon, agus Marsha Norman. How Could I Ever Know? Louisville, United States: Alfred Publishing Co., Inc., 1991.
Lua MLA (9ú heag.)Levine, Lucy Simon, agus Marsha Norman. How Could I Ever Know? Alfred Publishing Co., Inc., 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.