एपीए उद्धरण

Sviokla, J. J., & Shapiro, B. P. (1993). Keeping customers (11th ed.). HBR.

शिकागो स्टाइल उद्धरण

Sviokla, John J., और Benson P. Shapiro. Keeping Customers. 11th ed. HBR, 1993.

एमएलए उद्धरण

Sviokla, John J., और Benson P. Shapiro. Keeping Customers. 11th ed. HBR, 1993.