Gilbert, M. 1., & Gilbert, M. 1. (1954). An International comparison of national products and the purchasing power of currencies: A study of the United States, The United Kingdom, France, Germany and Italy. Paris: Organization for European Economic Cooperation.

Gilbert, Milton 1909, and Milton 1909 Gilbert. An International Comparison of National Products and the Purchasing Power of Currencies: A Study of the United States, The United Kingdom, France, Germany and Italy. Paris: Organization for European Economic Cooperation, 1954.

Gilbert, Milton 1909, and Milton 1909 Gilbert. An International Comparison of National Products and the Purchasing Power of Currencies: A Study of the United States, The United Kingdom, France, Germany and Italy. Paris: Organization for European Economic Cooperation, 1954.