Schwartz, T. (1980). The art of logical reasoning. Random House.
Chicago Style (17th ed.) ZitazioaSchwartz, Thomas. The Art of Logical Reasoning. New York: Random House, 1980.
MLA (9th ed.) ZitazioaSchwartz, Thomas. The Art of Logical Reasoning. Random House, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.