Cita APA (7a ed.)
Vaupel, R., Schmolke, G., & Krüger, A. Costumer-focused management by projects. Macmillan.
Cita estilo Chicago (17a ed.)
Vaupel, Ronald, Gernot Schmolke, y Andreas Krüger. Costumer-focused Management by Projects. Houndmills, Inglaterra: Macmillan.
Cita MLA (9a ed.)
Vaupel, Ronald, et al. Costumer-focused Management by Projects. Macmillan.
警告：這些引文格式不一定是100％准確.