APA

Seglin J. L., . (1989). The AMA handbook of business letters. New York, NY: American Management Association.

Chicago

Seglin Jeffrey L, . 1989. The AMA handbook of business letters. New York, NY: American Management Association.

Harvard

Seglin J. L., . (1989). The AMA handbook of business letters. New York, NY: American Management Association.

MLA

Seglin Jeffrey L, . The AMA handbook of business letters. New York, NY: American Management Association. 1989.