APA

Foulke R. A., . (1941). The sinews of American commerce. New York: Dunn & Bradstreet, Inc.

Chicago

Foulke Roy A, . 1941. The sinews of American commerce. New York: Dunn & Bradstreet, Inc.

Harvard

Foulke R. A., . (1941). The sinews of American commerce. New York: Dunn & Bradstreet, Inc.

MLA

Foulke Roy A, . The sinews of American commerce. New York: Dunn & Bradstreet, Inc. 1941.