APA

Poe R. W., . (1983). The McGraw-Hill Handbook of business letters. New York: McGraw-Hill.

Chicago

Poe Roy W, . 1983. The McGraw-Hill Handbook of business letters. New York: McGraw-Hill.

Harvard

Poe R. W., . (1983). The McGraw-Hill Handbook of business letters. New York: McGraw-Hill.

MLA

Poe Roy W, . The McGraw-Hill Handbook of business letters. New York: McGraw-Hill. 1983.