compiled and edited by L. L. Farkas
McGraw-Hill, 1966
Buku Teks
Bolton, W. (William), 1933-, author
Longman Scientific & Technical, 1992
Buku Teks
Loveday, George, author
Longman, 1995
Buku Teks
Robinson, Vester, author
Reston Publishing Company, 1974
Buku Referensi
Lenk, John D., author
McGraw-Hill, 1994
Buku Referensi