Rigo, R. C., Imbang, P. G., & Cruz, P. E. (2009). Voice over internet protocol in small and medium enterprises. University of the Philippines Diliman.
Citace podle Chicago (17th ed.)Rigo, Ricardo C., Prof. Glen Imbang, a Prof. Edison Cruz. Voice over Internet Protocol in Small and Medium Enterprises. Quezon City: University of the Philippines Diliman, 2009.
Citace podle MLA (9th ed.)Rigo, Ricardo C., et al. Voice over Internet Protocol in Small and Medium Enterprises. University of the Philippines Diliman, 2009.
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