Ur, P. (1981). Discussions that work. Cambridge University Press.
Chicagoスタイル(17版)引用形式Ur, Penny. Discussions That Work. Cambridge: Cambridge University Press, 1981.
MLA(9版)引用形式Ur, Penny. Discussions That Work. Cambridge University Press, 1981.
警告: この引用は必ずしも正確ではありません.