Fun stuff. So I have a new-ish book about employer/employee management tips. Yesterday, I picked up an older book which probably informed all the managers and executives who used the technique and thus were eligible to be cited in the newer book about the older research that supported use of the technique. The principle of the thing has not changed. The old book is not outdated or bad; the newer book was never needed! 

My garden in England is full of eating-out places, for heat waves, warm September evenings, or lunch on a chilly Christmas morning. (Mary Quant)