Carroll, John Millar, 1925-
McGraw-Hill, 1956
Buku Teks
Green, D.C.
Longman, 1988
Buku Teks
Ryder, John D. (John Douglas)
McGraw-Hill, 1957
Buku Teks
Charles A. Harper, editor-in-chief
McGraw-Hill, 1977
Buku Referensi
Jones, Thomas H.
Reston Publishing Company, 1978
Buku Referensi