Yayasan Proklamasi, [date of publication not identified]
Buku Teks SO
Brown, Joe David
Time Incorporated, 1961
Buku Teks SO
Brion, Marcel, 1895-1984
Elek Books, 1959
Buku Teks SO
KARUNAKARAN, K.P.
Oxford University Pres, 1952
Buku Teks
Lamb, Beatrice Pitney
Frederick A. Praeger , 1968
Buku Teks SO