Ехо (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ехо" in Bulgarian language version.

refsWebsite

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1wikisource.org

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archive.org

Wölfel, Matthias, McDonough, John. Distant Speech Recognition. Chichester, John Wiley & Sons, 2009. ISBN 0470714077. с. 48.

tufts.edu

perseus.tufts.edu

ἦχος, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus

wikisource.org

ru.wikisource.org

Гезехус Н. А. Эхо, в физике // Энциклопедический словарь Брокгауза и Ефрона. Санкт Петербург, 1890 – 1907. с. 251 – 252.