1. For excellent books and review articles on chiral symmetries see: . Current Algebras (W. A. Benjamin, Inc. New York–Amsterdam, 1968);
2. , . “Lectures on Current Algebra and its applications” (Princeton University Press, New Jersey, 1972);
3. , and , Currents in Hadron Physics (North-Holland Pub. Company, Amsterdam – London 1973);
4. Departures from chiral symmetry
5. Chiral symmetry breaking and meson-nucleon sigma commutators: A review