Gross, Ernest A.
Harper & Brothers, 1962
Buku Teks
Griffith, Ernest S.
New York University press, 1956
Buku Teks
Dichter, Ernest
McGraw-Hill, 1971
Buku Teks
Schusky, Ernest l.
Holt Rinehart and Winston, 1975
Buku Teks
Kamm, Ernest R
Macmillan, 1981
Buku Teks