APA (7 ম সংস্করণ) উদ্ধৃতি

Sewell Carl. (1990). Customers for Life: How to turn that one-time buyer into a lifetime customer. Pocket Books Publishing.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Sewell Carl. Customers for Life: How to Turn That One-time Buyer into a Lifetime Customer. NewYok: Pocket Books Publishing, 1990.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Sewell Carl. Customers for Life: How to Turn That One-time Buyer into a Lifetime Customer. Pocket Books Publishing, 1990.