Cynthia Lucia, Roy Grundmann, Arthur Simon, editors
Wiley Balckwell, 2016
Buku Teks SO
Woll, Peter
Longman , 2001
Buku Teks SO
Wilfred D. Webb
Thomas Y. Crowell Company, 1961
Buku Teks
Woll, Peter
Little, Brown, 1984
Buku Teks SO
Woll, Peter
Little, Brown, 1965
Buku Teks SO