edited by Richard A. Danner and Marie-Louise H. Bernal
Oceana Publications, 1994
Buku Teks SO
Merryman, John Henry
Bobbs-Merril, 1978
Buku Teks SO
Southern Methodist University Press, 1960
Buku Teks
Coleman, James C.
Scott, Foresman,, 1986
Buku Teks SO
Cahill, Fred V.
Ronald Press, 1952
Buku Teks