The Books of Haggai, Zechariah and Malachi (Cambridge Bible Commentary). Commentary by Rex Mason. (Cambridge: Univerity Press. 1977. xii, 168 pp. £7.50 hardback; £3.30 paperback.)/The Second Book of Samuel (Cambridge Bible Commentary). Commentary by P. R. Ackroyd. (Cambridge: University Press. 1977. xii, 247 pp. £8 hardback, £3.25 paperback.)