Willoughby, W. W. (1925). Opium as an international problem, the Geneva conferences. John Hopkins Press.
Chicagoスタイル(17版)引用形式Willoughby, Westel Woodbury. Opium as an International Problem, the Geneva Conferences. Baltimore: John Hopkins Press, 1925.
MLA(9版)引用形式Willoughby, Westel Woodbury. Opium as an International Problem, the Geneva Conferences. John Hopkins Press, 1925.
警告: この引用は必ずしも正確ではありません.