Andrews, Wayne
Macmillan, 1978
Buku Teks
Moon, Glenn W., author
Holt, Rinehart and Winston, 1964
Buku Teks
Canfield, Leon H., author
Houghton Mifflin, 1954
Buku Teks
Nevins, Allan, 1890-1971, author
The Modern Library, 1942
Buku Teks
Harlow, Ralph Volney, author
Holt, Rinehart and Winston, 1961
Buku Teks