Nadel, S.F. (Siegfried Frederick), author
The Free Press of Glencoe, 1964
Buku Teks
Nadel, S.F. (Siegfried Frederick), author
Cohen & West, 1969
Buku Teks
Piddington, Ralph, author
Eidenburgh Oliver , 1960
Buku Teks
Beattie, John, author
The Free Press, 1964
Buku Teks
Bohannan, Paul, author
Holt, Rinehart and Winston, 1963
Buku Teks