Bals, L., & Hartmann, E. (2008). Sourcing of services. Nova Science Publishers.
芝加哥风格引文Bals, Lydia, 与 Evi Hartmann. Sourcing of Services. New York: Nova Science Publishers, 2008.
MLA引文Bals, Lydia, 与 Evi Hartmann. Sourcing of Services. Nova Science Publishers, 2008.
警告：这些引文格式不一定是100％准确.