APA
Heck H. J., American Management Association (New York), . (1969). The International business environment. New York: American Management Association.
Chicago
Heck Harold J, American Management Association (New York), . 1969. The International business environment. New York: American Management Association.
Harvard
Heck H. J., American Management Association (New York), . (1969). The International business environment. New York: American Management Association.
MLA
Heck Harold J, American Management Association (New York), . The International business environment. New York: American Management Association. 1969.