Travis, W. P. (1964). The theory of trade and protection. Harvard Univ..
Chicagoスタイル(17版)引用形式Travis, William Penfield. The Theory of Trade and Protection. Cambridge: Harvard Univ., 1964.
MLA(9版)引用形式Travis, William Penfield. The Theory of Trade and Protection. Harvard Univ., 1964.
警告: この引用は必ずしも正確ではありません.