A440 (pitch standard) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "A440 (pitch standard)" in English language version.

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Apel, Willi (1969). Harvard Dictionary of Music. Harvard University Press. ISBN 9780674375017. Retrieved 2023-01-09 – via Google Books.
Karp, Theodore (1983). Dictionary of Music. Northwestern University Press. p. 406. ISBN 9780810106598. Retrieved 2023-01-09 – via Google Books.
Robert Thomas Beyer (1999). Sounds of our times: two hundred years of acoustics. Springer. p. 32. ISBN 978-0-387-98435-3. Retrieved 2023-01-09 – via Google Books.
von Helmholtz, Hermann (1863). Die Lehre von den Tonempfindungen als physiologische Grundlage für die Theorie der Musik [The Study of the Sensations of Tone as a Physiological Foundation for the Theory of Music (alt: The Sensation of Tones)] (in German). J. Vieweg. p. 29. Retrieved 2023-01-09 – via Google Books, (pre-ISBN); see article on book Sensations of Tone.
Martin, George (2008). The Opera Companion. Hal Leonard Corporation. ISBN 978-1-57467-168-1. Retrieved 2023-01-09 – via Google Books.