3
by Pray, Leslie A.
Published 2012
National Academies Press

5
by Edmunds, Margaret
Published 1998
National Academy Press

6
by Hernandez, Donald J.
Published 1999
National Academy Press

7
by Niessen, Louis W.
Published 2012
Agency for Healthcare Research and Quality, U.S. Department of Health and Human Services

10
by Packham, Karen
Published 2010
Royal College of Obstetricians and Gynaecologists

13
Published 2004
National Academies Press

14
by Ver Ploeg, Michele
Published 2004
The National Academies Press

16
by Swift, Elaine K.
Published 2002
National Academies Press

18
by Breiner, Heather, Parker, Lynn, Olson, Steve
Published 2013
National Academies Press

19
Published 2009
National Academies Press