(en) Alan Bellows, Alien Hand Syndrome : And Other Too-Weird-Not-To-Be-True Stories (A Booger A Day Keeps The Doctor Away : A Medical Doctor Describes the Health Benefits of Nose-Mining), Workman Publishing, , 294 p. (ISBN978-0-7611-5225-5, lire en ligne), p. 28–30.
(en) « A review of nose picking in primates with new evidence of its occurrence in Daubentonia madagascariensis », Journal of Zoology, (lire en ligne)