APA (7th ed.) Citation

Hope Simpson, J. (1939). The refugee problem: Report of a survey. Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Hope Simpson, John. The Refugee Problem: Report of a Survey. London [u.a.]: Oxford Univ. Press, 1939.

MLA (9th ed.) Citation

Hope Simpson, John. The Refugee Problem: Report of a Survey. Oxford Univ. Press, 1939.