Hayes, Patrick
John Wiley & Sons, 1975
Buku Teks SO
Boas, Mary L.
John Wiley & Sons, 1983
Buku Teks SO
Potter, Merle C.
Prentice-Hall, 1978
Buku Teks SO
Boas, Mary L.
John Wiley & Sons, 2006
Buku Teks SO
edited by Kenneth J. Arrow, Samuel Karlin, and Patrick Suppes
Stanford University Press, 1960
Buku Teks SO