The quark model / J. J. J. Kokkedee. Kokkedee, J. J. J. Quarks. QC721 .K68 530.2 KOQ Includes reprints of papers on quarks by various authors (p. 118-233) Includes bibliographies. New York : W. A. Benjamin, 1969. 1969. 1969 Text xiv, 239 p. : eng Frontiers in physics