Jan Bondeson
Unknown Author
Marshall Houts
World Health Organization (WHO)
Bobbi Jo O'Neal
Oliver Warner
Randy Hanzlick
M. A. Heasman
New York State Task Force on Life and the Law.
Rolf Emmrich
M. F. Steen
Robert P. Morhardt
National Center for Health Statistics (U.S.)
World Health Organization
Office for National Statistics
Gerard H. Reinert
Great Britain. General Register Office
United States. National Committee on Vital and Health Statistics