VIGNAULT, W. L. (1987). Worldwide Telecommunications Guide For The Business Manager Walter L. Vignault. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)VIGNAULT, Walter L. Worldwide Telecommunications Guide For The Business Manager Walter L. Vignault. John Wiley & Sons, 1987.
Lua MLA (8ú heag.)VIGNAULT, Walter L. Worldwide Telecommunications Guide For The Business Manager Walter L. Vignault. John Wiley & Sons, 1987.
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