Clarke , L. (1997). The essence of chnage. PHI.
Lua i Stíl Chicago (17ú heag.)Clarke , Liz. The Essence of Chnage. New Delhi: PHI, 1997.
Lua MLA (9ú heag.)Clarke , Liz. The Essence of Chnage. PHI, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.