Kroeber, Karl
Harper and Row, 1965
Buku Teks SO
Kennedy, X.J.
Pearson Longman , 2005
Buku Teks SO
Doren, Mark van
Hill & Wang, 1966
Buku Teks SO
by Herbert Barrows [and others]; under the general editorship of Gordon N. Ray
Houghton Miffiln, 1959
Buku Teks SO
Hubell, Jay Broadus
Macmillan, 1922
Buku Teks SO