Spence, Jonathan D.
Norton Company, , 1990
Buku Teks SO
Liberal Arts Press,, 1959
Buku Teks SO
Spence, Jonathan D.
The Viking, , 1981.
Buku Teks SO
Fairbank, Wilma
University of Pennsylvania Press, 1994
Buku Teks SO
edited by Daniel Fischlin and Mark Fortier
Routledge, 2000
Buku Teks SO