APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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