Gw mau tau See also dari Endoskopi. Jelasin dalam bahasa melayu

Armin Gärtner; medical technics and information technologie, Band II. Medizintechnik und Informationstechnologie, Band II. ISBN 3-8249-0941-3.

Obituary: Professor Harold Hopkins, FRS, The Times, 3 Nov 1994.

Bittner JG, et al. Resident training in flexible gastrointestinal endoscopy: a review of current issues and options. J Surg Educ. 2007 Nov-Dec;64(6):399-409. PMID 18063277