Bessant, John
Gower , 1985
Buku Teks SO
Artikel Jurnal
[edited by] Susan Stern
Frankfurter Allgemeine Zeitung GmbH Informationsdienste, c1991
Buku Teks SO
Harlow, Ralph Volney
Holt, Rinehart and Wiston, 1961
Buku Teks
Harlow, Ralph Volney
Holt, Rinehart and Wiston, 1961
Buku Teks