APA Style

Yukl, G, A, Y., Gardner, W, L. (2020). Leadership in organizations (Ninth edition, Global edition). Harlow, United Kingdom: Pearson Education.

MLA Style

Yukl, Gary, A., Yukl., Gardner, William, L.. "Leadership in organizations". Ninth edition, Global edition Harlow, United Kingdom: Pearson Education, 2020. Books.