Cita APA (7a ed.)

DRUCKER PETER F. (1999). MANAGEMENT CHALLENGES FOR THE 21ST CENTURY. BUTTERWORTH-HEINEMANN.

Cita Chicago Style (17a ed.)

DRUCKER PETER F. MANAGEMENT CHALLENGES FOR THE 21ST CENTURY. OXFORD: BUTTERWORTH-HEINEMANN, 1999.

Cita MLA (9a ed.)

DRUCKER PETER F. MANAGEMENT CHALLENGES FOR THE 21ST CENTURY. BUTTERWORTH-HEINEMANN, 1999.