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..
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Chicago-čujuhus (17. p.)
Landis, Matthew M., juo 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.
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MLA-čujuhus (9. p.)
Landis, Matthew M., juo Robert A. Lloyd. The 3CX IP PBX Tutorial: Develop a Fully Functional, Low Cost, Professional PBX Phone System Using 3CX. Packt Pub., 2010.
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