APA
O'Shaughnessy John, . (1987). Why people buy. Oxford University press, New York: .
Chicago
O'Shaughnessy John, . 1987. Why people buy. Oxford University press, New York: .
Harvard
O'Shaughnessy John, . (1987). Why people buy. Oxford University press, New York: .
MLA
O'Shaughnessy John, . Why people buy. Oxford University press, New York: . 1987.