Foshay, A. W. (1962). Educational achievements of thirteen-year-olds in twelve countries: Results of an international research project, 1959-61. UNESCO Institute for Education.

Foshay, Arthur Wellesley. Educational Achievements of Thirteen-year-olds in Twelve Countries: Results of an International Research Project, 1959-61. Hamburg: UNESCO Institute for Education, 1962.

Foshay, Arthur Wellesley. Educational Achievements of Thirteen-year-olds in Twelve Countries: Results of an International Research Project, 1959-61. UNESCO Institute for Education, 1962.