Whistling (English Wikipedia)

Busnel, René Guy; Classe, André (March 8, 1976). Whistled languages. Springer-Verlag. ISBN 9780387077130 – via Google Books.
Hughes, Maureen. A History of Pantomime, p. 31 (2013).
Asbury, Nick. Exit Pursued by a Badger: An Actor's Journey Through History with Shakespeare, p. 134 (Oberon Books 2009).
Wright, Elizabeth Mary (1913). Rustic speech and folk-lore. H. Milford. p. 197.
"Notes and Queries, Fifth series". 2. London: Oxford Journals, Oxford University. October 3, 1874: 264. {{cite journal}}: Cite journal requires |journal= (help)
Taylor, Archer (April 1917). "Three Birds of Ill Omen in British Folklore – III. The Seven Whistlers". Washington University Studies. IV (2). St Louis, Missouri: Washington University: 167–173.

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Martha fluit (2023, 23 oktober). Martha Froukje Mees, Erasmiaanse Namen, Erasmiaans Gymnasium.https://www.erasmiaans.nl/2023/01/02/martha-mees/
Martha fluit (2023, 23 oktober). Martha Froukje Mees, Erasmiaanse Namen, Erasmiaans Gymnasium.https://www.erasmiaans.nl/2023/01/02/martha-mees/

GaboudAchk (January 24, 2009). "Evil Eye...... Growing Up". Experience Project. Archived from the original on March 3, 2016. Retrieved May 20, 2012.

"Daily Traditions". Fantastic Asia Ltd. Archived from the original on November 16, 2019. Retrieved May 20, 2012.

"Belide Tribe 22.000". Indonesia Traveling. Archived from the original on March 7, 2016. Retrieved May 20, 2012.

Snow called it the "signature whistle" that gave the music part of its "scariness". Greiving, Tim (January 22, 2016). "As 'X-Files' Returns, Meet The Man Behind The Theme Song". NPR. Retrieved January 23, 2016.

Tate (June 30, 2009). "Things Fall Apart – Ch 2". Washington State School for the Blind. Archived from the original on November 11, 2010. Retrieved May 20, 2012.

"Prairie dog alarm calls encode labels about predator colors. By: N. Slobodchiko V · Andrea Paseka · Jennifer L. Verdolin. Published 31 December 2008 via Springer-Verlag" (PDF). Archived from the original (PDF) on June 2, 2021. Retrieved May 29, 2021.
Tate (June 30, 2009). "Things Fall Apart – Ch 2". Washington State School for the Blind. Archived from the original on November 11, 2010. Retrieved May 20, 2012.
"Daily Traditions". Fantastic Asia Ltd. Archived from the original on November 16, 2019. Retrieved May 20, 2012.
"Belide Tribe 22.000". Indonesia Traveling. Archived from the original on March 7, 2016. Retrieved May 20, 2012.
GaboudAchk (January 24, 2009). "Evil Eye...... Growing Up". Experience Project. Archived from the original on March 3, 2016. Retrieved May 20, 2012.