Fowler, Robert Booth
Praeger, 1985
Buku Teks SO
Sargent, Lyman Tower
Wadsorth Thompson Learning, 2003
Buku Teks SO
Sargent, Lyman Tower
Brooks Cole, 1990
Buku Teks SO
[compiled by] J. Charles King [and] James A. McGilvray
McGraw-Hill, 1973
Buku Teks SO
Kymlicka, Will
Clarendon Press, 1990
Buku Teks SO