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Uri Abraham and Richard A. Shore , Initial segments of the degrees of size ℵ1, Israel journal of Mathematics, vol. 53 (1986), no. 1, pp. 1–51.
Jon Barwise , Admissible Sets and Structures, Springer-Verlag, Berlin, 1975.
Keith J. Devlin , Constructibility, Perspectives in Mathematical Logic, Springer-Verlag, Berlin, 1984.
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Manuel Lerman , Degrees of Unsolvability, Perspectives in Mathematical Logic, Springer-Verlag, Berlin, 1983, Local and global theory.
D. A. Martin , Borel determinacy. Annals of Mathematics (2), vol. 102 (1975), no. 2, pp. 363–371.
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Arnold W. Miller , Infinite combinatorics and definability, Annals of Pure and Applied Logic, vol. 41 (1989), no. 2, pp. 179–203.
Gerald E. Sacks , Higher Recursion Theory, Perspectives in Mathematical Logic, Springer-Verlag, Berlin, 1990.
Stephen G. Simpson , Minimal covers and hyperdegrees, Transactions of the American Mathematical Society, vol. 209 (1975), pp. 45–64.
Robert M. Solovay , A model of set-theory in which every set of reals is Lebesgue measurable. Annals of Mathematics (2), vol. 92 (1970), pp. 1–56.