He may have been thinking of other books on similar subjects. For example, Mark Urban's book 'The Tank War' (and accompanying TV series 'Tankies'), which followed 5 RTR through WW2 from France to North Africa, back to the UK and then to Normandy and Germany included a lot of primary evidence regarding those attitudes, including diary entries made at the time, as well as interviews with the veterans. He also did a lot of research into disciplinary records, Courts Martial and medical stats re shell-shock to see if there was any difference in the mental state of Africa veterans in Normandy compared to the others.