Jill Kraye and M. W. F. Stone
Routledge, 2000
Buku Teks SO
edited by James L. Jarrett and Sterling M. McMurrin
Henry Holt, 1954
Buku Teks SO
Mayer, Frederick
American Book Company, 1951
Buku Teks SO
Bertens, Kees
Daras, 2005
Buku Teks SO
Mayer, Frederick
American Book Company, 1951
Buku Klasik