1. Sources of Quantum Mechanics;Van der Waerden,1967
2. H. W. Kroto, Molecular Rotation Spectra, originally published 1974 by Wiley. Then republished by Dover in 1992 as a paperback, with an extra preface including many spectra. Now republished in Phoenix editions 2003.
3. Tilden Lecture. Semistable molecules in the laboratory and in space
4. The Spectra of Interstellar Molecules