Cita APA (7a ed.)

Drucker Peter F. (2017). What Makes an Effective Executive. HBSP.

Cita Chicago Style (17a ed.)

Drucker Peter F. What Makes an Effective Executive. Boston, U.S: HBSP, 2017.

Cita MLA (9a ed.)

Drucker Peter F. What Makes an Effective Executive. HBSP, 2017.