«How Sound Propagates». Princeton University Press. [Consulta: 9 febrer 2016]. (quoting from Aristotle's Treatise on Sound and Hearing)
st-and.ac.uk
www-groups.dcs.st-and.ac.uk
«Abu Arrayhan Muhammad ibn Ahmad al-Biruni». School of Mathematics and Statistics, University of St. Andrews, Scotland, novembre 1999. Arxivat de l'original el 2016-11-21. [Consulta: 20 agost 2018].
tufts.edu
perseus.tufts.edu
Akoustikos Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus
Akoustos Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus
Akouo Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus
web.archive.org
«Abu Arrayhan Muhammad ibn Ahmad al-Biruni». School of Mathematics and Statistics, University of St. Andrews, Scotland, novembre 1999. Arxivat de l'original el 2016-11-21. [Consulta: 20 agost 2018].
Whewell, William, 1794-1866.. History of the inductive sciences : from the earliest to the present times. Volume 2, p. 295. ISBN 978-0-511-73434-2. OCLC889953932.
Pierce, Allan D.. Acoustics : an introduction to its physical principles and applications. 1989. Woodbury, N.Y.: Acoustical Society of America, 1989. ISBN 0-88318-612-8. OCLC21197318.
