Eliscu, Jenny (2004). „Fiona Apple”. Ур.: Brackett, Nathan; Hoard, Christian D. The New Rolling Stone Album Guide (4th изд.). New York: Fireside. стр. 23. ISBN0-74-320169-8.
Eliscu, Jenny (2004). „Fiona Apple”. Ур.: Brackett, Nathan; Hoard, Christian D. The New Rolling Stone Album Guide (4th изд.). New York: Fireside. стр. 23. ISBN0-74-320169-8.
„Fiona Apple with David Garza and Damien Rice”. San Diego Arts. Архивирано из оригинала 01. 01. 2021. г. Приступљено 20. 11. 2019. Though most of her lyrics are sung in a straightforward pop contralto, she judiciously adds vibrato, sudden jumps into her head voice, and rapid reiterations of the same pitch (what academics in the classical music field call a "Monteverdi vibrato").
Norris, John (26. 6. 2012). „Fiona Apple: Idling No More”. V. New York City: Visionaire. Архивирано из оригинала 04. 08. 2018. г. Приступљено 4. 8. 2018.
Norris, John (26. 6. 2012). „Fiona Apple: Idling No More”. V. New York City: Visionaire. Архивирано из оригинала 04. 08. 2018. г. Приступљено 4. 8. 2018.
„Fiona Apple with David Garza and Damien Rice”. San Diego Arts. Архивирано из оригинала 01. 01. 2021. г. Приступљено 20. 11. 2019. Though most of her lyrics are sung in a straightforward pop contralto, she judiciously adds vibrato, sudden jumps into her head voice, and rapid reiterations of the same pitch (what academics in the classical music field call a "Monteverdi vibrato").