APA
Dunham Andrea, Marcus Barry, . (1993). Unique value : The secret of all great business strategies. New York: Macmillan Publishing Co.
Chicago
Dunham Andrea, Marcus Barry, . 1993. Unique value : The secret of all great business strategies. New York: Macmillan Publishing Co.
Harvard
Dunham Andrea, Marcus Barry, . (1993). Unique value : The secret of all great business strategies. New York: Macmillan Publishing Co.
MLA
Dunham Andrea, Marcus Barry, . Unique value : The secret of all great business strategies. New York: Macmillan Publishing Co. 1993.