Firth, Raymond
The New American Library, 1958
Buku Teks SO
Firth, Raymond
Thomas Nelson and Sons, 1947
Buku Teks
Gillin, John Philip
University of Pittsburgh Press, 1969
Buku Teks SO
Pelto, Gretel H.
Macmillan, 1979
Buku Teks SO
Marcus, George E.
The University of Chicago Press, 1986
Buku Teks SO