APA

Classen H. G., . (1966). Better business English. New York: Arco Pub. Co.

Chicago

Classen H George, . 1966. Better business English. New York: Arco Pub. Co.

Harvard

Classen H. G., . (1966). Better business English. New York: Arco Pub. Co.

MLA

Classen H George, . Better business English. New York: Arco Pub. Co. 1966.