berikut ini beberapa artikel dan penelitian yang menunjukkan efek negatif dari penggunaan USG dan Doppler
http://articles.mercola.com/sites/articles/archive/2001/12/19/ultrasound.aspx?aid=CD945 http://douglassreport.com/2004/05/28/negative-effects-of-ultra-sounds/ http://aamishop.com/index.php?main_page=product_info&cPath=8&products_id=155 http://midwiferytoday.com/articles/ultrasoundrodgers.asp http://www.midwiferytoday.com/articles/ultrasound.asp http://www.jultrasoundmed.org/ http://www.sciencedaily.com/releases/2010/08/100817161100.htm http://www.telegraph.co.uk/news/uknews/1364783/Ultrasound-scans-linked-to-brain-damage-in-babies.html http://www.plus-size-pregnancy.org/Prenatal% 20Testing/prenataltest-ultrasoundsafety.htm http://www.themidwifenextdoor.com/?p=410 http://www.youtube.com/watch?v=mZDinmnt60s http://www.sciencedaily.com/releases/2010/03/100315103808.htm http://www.birth.com.au/Ultrasounds/Physical-effects-and-research.aspx?p=1 http://www.naturalnews.com/028853_ultrasound_fetus.html http://www.youtube.com/watch?v=YfaUQCp6L1s http://www.kindredcommunity.com/articles/ultrasound-scans-cause-for-concern/p/1279 http://www.greenhealthwatch.com/newsstories/newslatest/latest0701/ultrasound-hurt.html http://authenticmidwiferyeducationfromaami.blogspot.com/2009/09/high-tech-midwifery-i-wrote-for.html http://www.ob-ultrasound.net/history1.html http://www.planetc1.com/cgi-bin/n/v.cgi?c=1&id=1155156248 http://www.aims.org.uk/Journal/Vol11No4/ultra2.htm http://www.articlesnatch.com/Article/Is-Pregnancy-Ultrasound-Risky-/56304 http://www.birth.com.au/Ultrasounds/Physical-effects-and-research.aspx?p=1 http://www.joyousbirth.info/forums/showthread.php?t=71