Cita APA (7a ed.)

DRUCKER P. (1989). MANAGEMENT CHALLENGES FOR 21ST CENTURY. BUTTER WORTH.

Cita Chicago Style (17a ed.)

DRUCKER P. MANAGEMENT CHALLENGES FOR 21ST CENTURY. OXFORD: BUTTER WORTH, 1989.

Cita MLA (9a ed.)

DRUCKER P. MANAGEMENT CHALLENGES FOR 21ST CENTURY. BUTTER WORTH, 1989.