Cita APA (7a ed.)

Harper, H. R. (1931). What european and american students think on international problems: A comparative study of the world-mindedness of university students. Columbia University.

Cita Chicago Style (17a ed.)

Harper, Heber Reece. What European and American Students Think on International Problems: A Comparative Study of the World-mindedness of University Students. New York: Columbia University, 1931.

Cita MLA (9a ed.)

Harper, Heber Reece. What European and American Students Think on International Problems: A Comparative Study of the World-mindedness of University Students. Columbia University, 1931.