APA
Drucker p. F., . (1990). Managing the non-Profit organization. New York: Harper collins publications inc.
Chicago
Drucker peter Ferdinand, . 1990. Managing the non-Profit organization. New York: Harper collins publications inc.
Harvard
Drucker p. F., . (1990). Managing the non-Profit organization. New York: Harper collins publications inc.
MLA
Drucker peter Ferdinand, . Managing the non-Profit organization. New York: Harper collins publications inc. 1990.