Glazebrook, P.R., author
Blackstones Press Ltd., 2000
Buku Teks
Leonard, V A
Charles C. Thomas, 1971
Buku Teks
Clinard, Marshall B. (Marshall Barron)
Holt, Rinehart and Winston, 1973
Buku Teks
Pageant Publishing, 2018
Majalah, Jurnal, Buletin
Lyman, Michael D., author
Pearson/Prentice Hall, 2005
Buku Teks