Elegant, Robert S.
St. Martin's Press, 1959
Buku Teks
general editor, Lynn Pan
Archipelago Press; Landmark Book, 1998
Buku Referensi
Hevi, Emmanuel John
F. A. Praeger, 1967
Buku Teks
Fitzgerald, Stephen
Cambridge University Press, 1972
Buku Teks
Elegant, Robert S.
Twayne Publishers, 1951
Buku Teks