21
Published 2002
National Academies Press

22
Published 2008
National Academies Press

23
Published 2000
National Academy Press

25
Published 2002
National Academy Press

27
by Goodman, Clifford
Published 1990
Council on Health Care Technology, Institute of Medicine, National Academy Press

29
by Gelijns, Annetine
Published 1991
National Academy Press

30
by Federhen, Scott
Published 2011
National Center for Biotechnology Information

31
Published 2006
National Center for Biotechnology Information

32
Published 2005
National Center for Biotechnology Information (NCBI)

35
Published 1988
National Academy Press

36
by Donaldson, Molla S.
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National Academy Press

38
Published 1998
National Academy Press

39
Published 1992
National Academy Press