Tiffany, William R.
McGraw-Hill, 1977
Buku Teks
Bobbs-Merrill Educational Publishing, 1979
Buku Teks
Holt, Rinehart and Winston, 1966
Buku Referensi
David B. Guralnik, general editor
The World Publishing Co., 1956
Buku Referensi
edited by Jess Stein
Random House, 1961
Buku Referensi