Bowker, Julie C.; Bowker, Matthew H.; Santo, Jonathan B.; Ojo, Adesola Adebusola; Etkin, Rebecca G.; Raja, Radhi (). „Severe Social Withdrawal: Cultural Variation in Past Hikikomori Experiences of University Students in Nigeria, Singapore, and the United States”. The Journal of Genetic Psychology. 180 (4–5): 217–230. doi:10.1080/00221325.2019.1633618. PMID31305235.
Hamasaki, Yukiko; Pionnié-Dax, Nancy; Dorard, Géraldine; Tajan, Nicolas; Hikida, Takatoshi (). „Identifying Social Withdrawal (Hikikomori) Factors in Adolescents: Understanding the Hikikomori Spectrum”. Child Psychiatry & Human Development. doi:10.1007/s10578-020-01064-8. PMID32959142.
Bowker, Julie C.; Bowker, Matthew H.; Santo, Jonathan B.; Ojo, Adesola Adebusola; Etkin, Rebecca G.; Raja, Radhi (). „Severe Social Withdrawal: Cultural Variation in Past Hikikomori Experiences of University Students in Nigeria, Singapore, and the United States”. The Journal of Genetic Psychology. 180 (4–5): 217–230. doi:10.1080/00221325.2019.1633618. PMID31305235.
Hamasaki, Yukiko; Pionnié-Dax, Nancy; Dorard, Géraldine; Tajan, Nicolas; Hikida, Takatoshi (). „Identifying Social Withdrawal (Hikikomori) Factors in Adolescents: Understanding the Hikikomori Spectrum”. Child Psychiatry & Human Development. doi:10.1007/s10578-020-01064-8. PMID32959142.