University of Chicago. Laboratory of Molecular Structure and Spectra & Platt, J. R. (1964). Free-electron theory of conjugated molecules: A source book. Papers of the Chicago group, 1949-1961. Laboratory of Molecular Structure and Spectra, Dept. of Physics, University of Chicago.

University of Chicago. Laboratory of Molecular Structure and Spectra and John Rader Platt. Free-electron Theory of Conjugated Molecules: A Source Book. Papers of the Chicago Group, 1949-1961. Chicago]: Laboratory of Molecular Structure and Spectra, Dept. of Physics, University of Chicago, 1964.

University of Chicago. Laboratory of Molecular Structure and Spectra and John Rader Platt. Free-electron Theory of Conjugated Molecules: A Source Book. Papers of the Chicago Group, 1949-1961. Laboratory of Molecular Structure and Spectra, Dept. of Physics, University of Chicago, 1964.