Pospesel, H. (1976). Predicate logic: Introduction to logic. Prentice Hall.
Cita Chicago (17th ed.)Pospesel, Howard. Predicate Logic: Introduction to Logic. Englewood Cliffs, New Jersey: Prentice Hall, 1976.
Cita MLA (9th ed.)Pospesel, Howard. Predicate Logic: Introduction to Logic. Prentice Hall, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.