21
Published 2014
National Academies Press

24
by Ackerman, Sandra
Published 1992
National Academy Press

25
Published 1994
National Academy Press

26
Published 1995
Institute of Medicine

28
Published 1999
National Academies Press

30
by Phelps, Paul B.
Published 1996
National Academies Press (US)

31
Published 1994
National Academies Press

33
by Mosteller, Frederick
Published 1989
National Academy Press

34
Published 1995
National Academy Press

35
Published 2007
National Academies Press

37
Published 2001
National Academy Press

38
by Goldsmith, Sara K.
Published 2001
National Academy Press

40
by Wegman, David H.
Published 2004
National Academies Press