Harrington, L. A., Friedman, H., & Harrington, L. A. (1985). Harvey Friedman's research on the foundations of mathematics. North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co..

Harrington, L. A.ed, Harvey Friedman, và L. A. Harrington. Harvey Friedman's Research on the Foundations of Mathematics. Amsterdam ; New York : New York, N.Y., U.S.A.: North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1985.

Harrington, L. A.ed, et al. Harvey Friedman's Research on the Foundations of Mathematics. North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1985.