by Field Marshal Earl Wavell., Main Heritage Compact General, D568.7 .W3 1931, Book, Item-ID: i25919003, BIB-ID: 2757258, Includes bibliographical references (page 248) and index.
by Harry N. Howard., Main Heritage Compact General, DR584 .H6 1931, Book, Item-ID: i25913839, BIB-ID: 2756945, Includes bibliographical references (pages 362-383).
by Sir E. Denison Ross., "First published 1 January 1931. Second impression 8 January 1931.", Main Heritage Shelves General, DS258 .R63 1931, Book, Item-ID: i10217174, BIB-ID: 1023352, Bibliography: p. [16]-18.