R.B.R.B.WoodwardR.B.R.B., RoaldR.HoffmannRoaldR., The Conservation of Orbital Symmetry, „Angewandte Chemie International Edition in English”, 8 (11), 1969, s. 781–853, DOI: 10.1002/anie.196907811, ISSN1521-3773(ang.).
worldcat.org
R.B.R.B.WoodwardR.B.R.B., RoaldR.HoffmannRoaldR., The Conservation of Orbital Symmetry, „Angewandte Chemie International Edition in English”, 8 (11), 1969, s. 781–853, DOI: 10.1002/anie.196907811, ISSN1521-3773(ang.).