Keeble, Richard
Routledge, 1994, 1944
Buku Teks
Edited by John A. Lent
The Iowa State University Press, 1971
Buku Teks
Stiles, Karl A.
McGraw-Hill, 1968
Buku Referensi
edited by Martyn V. Twigg
Wolfe Publishing, 1989
Buku Referensi
Skousen, Philip L.
McGraw-Hill, 2011
Buku Teks