Oligohydramnios: When Amniotic Fluid is Too Low 
Article from Pregnancy Today.
http://pregnancytoday.com/reference/articles/oligohydramnios.htmOligohydramnios 
A case study, including ultrasound images, from the Department of Radiology at Brigham and Women's Hospital.
http://brighamrad.harvard.edu/Cases/bwh/hcache/31/full.html
Institute for Advanced Medical Education: Oligohydramnios 
Introduction, assessment, sonograms, etiology, references, and a quiz.
http://www.iame.com/learning/olig/olig.html
High-Risk Pregnancy - Amniotic Fluid Problems 
Description, causes, concerns, symptoms, and treatment for hydramnios and oligohydramnios.
http://www.southeastmissourihospital.com/health/peds/hrpregnant/amniofp.htm
The Cochrane Library 
Abstract titled: Prophylactic versus therapeutic amnioinfusion for oligohydramnios in labour.
http://www.cochrane.org/reviews/en/ab000176.html
The Cochrane Library 
Abstract titled: Maternal hydration for increasing amniotic fluid volume in oligohydramnios and normal amniotic fluid volume.
http://www.cochrane.org/reviews/en/ab000134.html