Landis, M. M., & Lloyd, R. A. (2010). The 3CX IP PBX tutorial: Develop a fully functional, low cost, professional PBX phone system using 3CX. Packt Pub..
芝加哥风格引文Landis, Matthew M., 与 Robert A. Lloyd. The 3CX IP PBX Tutorial: Develop a Fully Functional, Low Cost, Professional PBX Phone System Using 3CX. Birmingham [England]: Packt Pub., 2010.
MLA引文Landis, Matthew M., 与 Robert A. Lloyd. The 3CX IP PBX Tutorial: Develop a Fully Functional, Low Cost, Professional PBX Phone System Using 3CX. Packt Pub., 2010.
警告：这些引文格式不一定是100％准确.