edited by Albert C. Baugh
Appleton-Century-Crofts, 1948.
Buku Teks
Klarer, Mario, 1962-
Routledge, 2005
Buku Teks
Klarer, Mario, 1962-
Routledge, 2005
Buku Teks
Ayers, David
Blackwell Publishing, 2008
Buku Teks
Whitla, William
Wiley-Blackwell, 2010
Buku Referensi