Cita APA (7a ed.)

Bals, L., & Hartmann, E. (2008). Sourcing of services. Nova Science Publishers, Inc..

Cita Chicago Style (17a ed.)

Bals, Lydia, y Evi Hartmann. Sourcing of Services. New York: Nova Science Publishers, Inc., 2008.

Cita MLA (8a ed.)

Bals, Lydia, y Evi Hartmann. Sourcing of Services. Nova Science Publishers, Inc., 2008.