- & HEFFNER, H. C. d. (1973). Modern theatre practice.--Ed. 5. Appleton-Century-Crofts.
Lua i Stíl Chicago (17ú heag.)- agus Huber C. dkk HEFFNER. Modern Theatre Practice.--Ed. 5. New York: Appleton-Century-Crofts, 1973.
Lua MLA (9ú heag.)- agus Huber C. dkk HEFFNER. Modern Theatre Practice.--Ed. 5. Appleton-Century-Crofts, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.