Hiskett, M.
Longmas, Green, 1957
Buku Teks SO
Mira Isara
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2006
UI - Skripsi Membership
Landau, Rom, 1899-
Unwin Brothers, 1958
Buku Teks
Landau, Rom, 1899-
George Allen and Unwin, 1958
Buku Teks SO
Nicholson, Reynold Alleyne
At The University Press, 1953
Buku Teks SO