APA

Drucker Peter F,, . (1969). The age of discontinuity : Guidelines to our changing society. New York: Harper & Row.

Chicago

Drucker Peter F,, . 1969. The age of discontinuity : Guidelines to our changing society. New York: Harper & Row.

Harvard

Drucker Peter F,, . (1969). The age of discontinuity : Guidelines to our changing society. New York: Harper & Row.

MLA

Drucker Peter F,, . The age of discontinuity : Guidelines to our changing society. New York: Harper & Row. 1969.