Clinton, J. Jarrett
Family Health Care, 1979
Buku Teks
Nafziger, E. Wayne, author
Cambridge University Press, 2006
Buku Teks
Alexander-Frutschi, author
Stanford Research Institute, 1963
Buku Teks
edited by Richard A. Easterlin
University of Chicago Press, 1980
Buku Teks
Buchanan, Norman S., author
The Twentieth Country Fund , 1955
Buku Teks