Američko udruženje za akušerstvo i ginekologiju (ACOG) je nacionalna medicinska organizacija koja zastupa više od 52.000 članova koji pružaju zdravstvenu zaštitu ženama Amerike.
(en)Kulasingam SL, Hughes JP, Kiviat NB, et al. (2002). „Evaluation of human papillomavirus testing in primary screening for cervical abnormalities: comparison of sensitivity, specificity, and frequency of referral”. JAMA288 (14): 1749–57. DOI:10.1001/jama.288.14.1749. PMID12365959.
„The 1988 Bethesda System for reporting cervical/vaginal cytologic diagnoses: developed and approved at the National Cancer Institute workshop in Bethesda, MD, December 12–13, 1988”. Diagn. Cytopathol.5 (3): 331–4. 1989. PMID2791840.
(en)Kulasingam SL, Hughes JP, Kiviat NB, et al. (2002). „Evaluation of human papillomavirus testing in primary screening for cervical abnormalities: comparison of sensitivity, specificity, and frequency of referral”. JAMA288 (14): 1749–57. DOI:10.1001/jama.288.14.1749. PMID12365959.
Yang GC, Alvarez II. Ultrafast Papanicolaou stain. An alternative preparation for fine needle aspiration cytology. Acta Cytol. 1995 Jan-Feb;39(1):55-60. Abstract