Cita APA (7a ed.)

Stiel, H., & Collins, D. (1994). Ultimate service: The complete handbook to the world of the concierge. Prentice-Hall/Career & Technology.

Cita Chicago Style (17a ed.)

Stiel, Holly, y Delta Collins. Ultimate Service: The Complete Handbook to the World of the Concierge. Englewood Cliffs, N.J: Prentice-Hall/Career & Technology, 1994.

Cita MLA (9a ed.)

Stiel, Holly, y Delta Collins. Ultimate Service: The Complete Handbook to the World of the Concierge. Prentice-Hall/Career & Technology, 1994.