Maor
Buku Teks
Sundquist, James L
The Brooking Institution, 1973
Buku Teks SO
Ware, Alan
Oxford University Press, 1996
Buku Teks SO
by S.R. Davis ... [and others]
Angus and Robertson, 1954
Buku Teks SO
Bulmer-Thomas, Ivor
Phoenix House Ltd., 1953
Buku Teks