Noble, Elmer R.
Gadjah Mada University Press, 1989
Buku Teks
by Elmer R. Noble ... [and others]
Lea & Febiger, 1989
Buku Referensi
Goater, Timothy M., 1959-
Cambridge University Press, 2014
Buku Teks
Cameron, Thomas W.M.
Methuen , 1962
Buku Teks
edited by Vicente Y. Belizario, Jr; Juan Antonio A. Solon
Johnson, 2000
Buku Teks SO