APA (7 ম সংস্করণ) উদ্ধৃতি

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

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

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