Duren, Univalent Functions, vol. 259, Springer, New York, NY, USA, 1983. Pommerenke, Boundary Behaviour of Conformal Maps, vol. 299, Springer, Berlin, Germany, 1992. Duren, Theory of Hp Spaces, Academic Press, New York, NY, USA, 1970. Garnett, Bounded Analytic Functions, vol. 96 of Pure and Applied Mathematics, Academic Press, New York, NY, USA, 1981.