John C. H. Wu, Fountain of Justice: A Study in Natural Law (New York, Sheed and Ward, 1955; Taipei, Mei Ya Publications, 1971).
For an excellent (if dated) review, one should read John T. Noonan, Jr.'s piece in the Harvard Law Review. The citation is: John T. Noonan, Jr., Review, 69 Harv. L. Rev. 1519 (1956).
A short biography and bibliography can be found here.