Hayes, Patrick
John Wiley & Sons, 1975
Buku Teks
Boas, Mary L.
John Wiley & Sons, 2006
Buku Teks
edited by Kenneth J. Arrow, Samuel Karlin, and Patrick Suppes
Stanford University Press, 1960
Buku Teks
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
Buku Teks
Boas, Mary L.
John Wiley & Sons, 1983
Buku Teks