Fenstad,J.E.ed, Fenstad, J. E., Gandy, R. O., & Sacks, G. E. (1974). Generalized recursion theory II: Proceedings of the 1977 Oslo symposium. North-Holland Pub. Co. ; sole distributors for the U.S.A. and Canada, Elsevier North-Holland.

Fenstad,J.E.ed, Jens Erik Fenstad, R. O. Gandy, và Gerald E. Sacks. Generalized Recursion Theory II: Proceedings of the 1977 Oslo Symposium. Amsterdam ; New York : New York: North-Holland Pub. Co. ; sole distributors for the U.S.A. and Canada, Elsevier North-Holland, 1974.

Fenstad,J.E.ed, et al. Generalized Recursion Theory II: Proceedings of the 1977 Oslo Symposium. North-Holland Pub. Co. ; sole distributors for the U.S.A. and Canada, Elsevier North-Holland, 1974.