APA

Beebe D. E. 1., .Business letters and comunications. New York: Alexander Hamilton Institute.

Chicago

Beebe Dwight Eastman 1878, .Business letters and comunications. New York: Alexander Hamilton Institute.

Harvard

Beebe D. E. 1., .Business letters and comunications. New York: Alexander Hamilton Institute.

MLA

Beebe Dwight Eastman 1878, .New York: Alexander Hamilton Institute. .