Cita APA (7a ed.)

Regents pub. co. (1977). The Blue book of business English. Regent Pub.

Cita Chicago Style (17a ed.)

Regents pub. co. The Blue Book of Business English. New york: Regent Pub, 1977.

Cita MLA (9a ed.)

Regents pub. co. The Blue Book of Business English. Regent Pub, 1977.