Gaya APA
Drucker, P, F. et al (2015).
Peter Drucker's Five Most Important Questions: Enduring Wisdom for Today's Leaders .
Amerika Serikat:
Wiley.
Gaya MLA
Drucker, Peter, F.. et al.
"Peter Drucker's Five Most Important Questions: Enduring Wisdom for Today's Leaders".
Amerika Serikat:
Wiley,
2015.
Text.