APA
Leterman E. G., . (1973). Sales and sales management. New York: Alexander Hamilton Institute.
Chicago
Leterman Elmer G, . 1973. Sales and sales management. New York: Alexander Hamilton Institute.
Harvard
Leterman E. G., . (1973). Sales and sales management. New York: Alexander Hamilton Institute.
MLA
Leterman Elmer G, . Sales and sales management. New York: Alexander Hamilton Institute. 1973.