Isaacs, Harold R., author
Secker & Warburg, 1938
Buku Teks
Isaacs, Harold R.
Standford University Press, 1951
Buku Teks
Isaacs, Harold R., author
Atheneum, 1968
Buku Teks
Isaacs, Harold R.
The John Day, 1961
Buku Teks
Isaacs, Harold R., author
Macmillan Company , 1947
Buku Teks