^Faust, translated into English prose, by A. Hayward. Second edition, E. Moxon, 1834, page 285
^Hines, Kathleen. "The Art of the Musical Zz: Cultural Implications of Lullabies around the World." Miwah Li, John Moeller, and Charles Smith Wofford College (2013): 74.
^Pathak, Vrushali, and Shefali Mishra. "Psychological effect of lullabies in child development." Indian Journal of Positive Psychology 8.4 (2017): 677-680.
^Levin, S. "The evil eye and the afflictions of children." South African Medical Journal 32.6 (1958).