Armitage, Angus
Mentor Books, 1952
Buku Teks
Armitge, Angus
The New American Library, 1956
Buku Teks
Buckley, Shawn
McGraw-Hill, 1979
Buku Teks
Stein, Gabriele
Tubiger Beitrage zur Linguistik, 1973
Buku Teks
Smyth, Joseph Hilton
Harrison-Hilton Books, 1939
Buku Teks