Não informado. (1985). Constructive Approximation. Springer Verlag.
Lua i Stíl Chicago (17ú heag.)Não informado. Constructive Approximation. New York: Springer Verlag, 1985.
Lua MLA (8ú heag.)Não informado. Constructive Approximation. Springer Verlag, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.