2
Published 1998
NCBI

3
by Field, Marilyn J.
Published 2004
National Academies Press

4
by Knobler, Stacey
Published 2005
National Academies Press

6
Published 2016
Canadian Agency for Drugs and Technologies in Health

8
Published 2018
The National Academies Press

11
by Pugh, Jonathan, Kahane, Guy, Savulescu, Julian
Published 2016
Oxford University Press

15
by Schaeffer, Leonard D.
Published 2009
National Academies Press

16
Published 1988
National Academy Press

17
by Olson, Steve
Published 1989
National Academy Press

18
Published 1991
National Academy Press

19
by Hanna, Kathi E.
Published 1991
National Academy Press