Cita APA (7th ed.)

Fleming, J. H., & Asplund, J. (2007). Human sigma: Managing the employee-customer encounter. Gallup Press.

Cita Chicago (17th ed.)

Fleming, John H., i Jim Asplund. Human Sigma: Managing the Employee-customer Encounter. New York: Gallup Press, 2007.

Cita MLA (9th ed.)

Fleming, John H., i Jim Asplund. Human Sigma: Managing the Employee-customer Encounter. Gallup Press, 2007.