Cita APA (7th ed.)

De Schiffrin, R. S. (1969). English in business. Longman.

Cita Chicago (17th ed.)

De Schiffrin, R S. English in Business. Lond.: Longman, 1969.

Cita MLA (8th ed.)

De Schiffrin, R S. English in Business. Longman, 1969.