Changes

*[https://babel.hathitrust.org/cgi/pt?id=uc1.b4522102;view=1up;seq=9 ''Engines of War: the Mechanised Army in Action''] Produced in collaboration with the War Office, published by Adam and Charles Black. 1941. Hathi Trust Digital Library.

*''Documents On British Foreign Policy 1919-1939 - Third Series'' published by HMSO from 1949. [https://archive.org/details/in.ernet.dli.2015.275035 Volume I 1938], [https://archive.org/details/in.ernet.dli.2015.276399 Volume II 1938],[https://archive.org/details/DocumentsOnBritishForeignPolicy1919-1939-ThirdSeriesVolumeVi1939_182 Volume VI 1939], [https://archive.org/details/DocumentsOnBritishForeignPolicy1919-1939-ThirdSeriesVolumeVi1939 Volume VII 1939], [https://archive.org/details/in.ernet.dli.2015.117700 Volume VIII 1938-39] Archive.org, including some from the Digital Library of India Collection. Volumes VIII is the first of two volumes relating to British policy in the Far East, the earlier volumes relating to European affairs. Volume X, not available online, is an index for the series. [http://diplomatic-documents.org/editions/united-kingdom Contents of the volumes] diplomatic-documents.org

== References ==