Johnson, H. G. (1968). The economic approach to social questions: An inaugural lecture delivered 12 October 1967, the London School of Economics and Political Science. Weidenfeld and Nicolson.

Johnson, Harry G. The Economic Approach to Social Questions: An Inaugural Lecture Delivered 12 October 1967, the London School of Economics and Political Science. London: Weidenfeld and Nicolson, 1968.

Johnson, Harry G. The Economic Approach to Social Questions: An Inaugural Lecture Delivered 12 October 1967, the London School of Economics and Political Science. Weidenfeld and Nicolson, 1968.