The HMO model and its application 
Heilbronner, Edgar.
Bock, Hans.
Martin, William,1923-
Rackstraw, Anthony J.
London Wiley [etc.],
1976
In 3 vols
'A Wiley-Interscience Publication'
Translation of: 'Das HMO-Modell und seine Anwendung'. Weinheim : Verlag Chemie, 1968-70
Includes bibliographies and index
Molecular orbitals.