<Li> Jump up ^ "Dysmenorrhea: Menstrual abnormalities". Merck Manual of Diagnosis and Therapy . 2005 . Retrieved 2007 - 10 - 20 . </Li> <Li> Jump up ^ Boon, Mathilde E.; Albert J.H. Suurmeijer (1996). The Pap Smear . Taylor & Francis . p. 87 . ISBN 3 - 7186 - 5857 - 7 . </Li> <Li> Jump up ^ Jane Bates (8 January 1997). Practical Gynaecological Ultrasound . Cambridge University Press . pp. 77--. ISBN 978 - 1 - 900151 - 51 - 1 . </Li>

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