Gaya APA

drucker, P, F., kuhl, J, S. (2015). Peter drucker's five most important questions : enduring wisdom for to days leaders . canada: john wiley.

Gaya MLA

drucker, Petter, F., kuhl, Joan, Snyder. "Peter drucker's five most important questions : enduring wisdom for to days leaders". canada: john wiley, 2015. Text.