E.W. Pugh, L.R. Johnson, and John H. Palmer, IBM's 360 and early 370 systems, MIT Press, Cambridge MA and London, ISBN 0-262-16123-0, includes extensive (819 pp.) treatment of IBM's offerings during this period Melinda Varian, VM and the VM community, past present, and future, SHARE 89 Sessions 9059-9061, 1997