Παραπομπή σε μορφή APA (7η εκδ.)

Drennan, D., & Pennington, S. (1999). 12 ladders to world class performance: How your organization can compete with the best in the world. Kogan Page.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Drennan, David, και Stewart Pennington. 12 Ladders to World Class Performance: How Your Organization Can Compete with the Best in the World. London: Kogan Page, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

Drennan, David, και Stewart Pennington. 12 Ladders to World Class Performance: How Your Organization Can Compete with the Best in the World. Kogan Page, 1999.