Ball, P. (2004). The essence of Tao. Eagle Editions.
Lua i Stíl Chicago (17ú heag.)Ball, Pamela. The Essence of Tao. London: Eagle Editions, 2004.
Lua MLA (9ú heag.)Ball, Pamela. The Essence of Tao. Eagle Editions, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.