Rujukan Yodel

  1. ↑ "Perfect Sound Forever: Yodel". Online Music Magazine. Diarkibkan daripada asal pada 4 Mac 2016. 
  2. ↑ Ling, Jan (1997). A history of European folk music. University Rochester Press. m/s. 32. ISBN 978-1-878822-77-2 
  3. ↑ "Will there be Yodeling in Heaven?". Wfmu.org. Dicapai 2012-09-24. 
  4. ↑ Chad L. Thompson: Yodeling of the Indiana Swiss Amish in Anthropological Linguistics Vol. 38, No. 3 (Fall, 1996), pp. 495-520