You will find the most up-to-date writing in a number of journals that will be helpful in your social work studies in all of your modules. Some are available online through the Lanchester Library, for example:
The 19th Century Origins of Social Work (Pages 664-666 of the article)
Social Work, the Second World War and the Post-War Welfare State (Pages 666-669 of the article)
The Seebohm Report (1968) and Social Services Departments (Pages 669-671 of the article)
Thatcherism and the New Right (Pages 672-674 of the article)