Warren, Peter, author
Hodder & Stoughton Ltd., 2013
Buku Teks
Nasution, Abdul Haris, 1918-2000, author
Seruling Masa , 1970
Buku Teks
Kautsky, John H.
Krieger Pub. Co, 1980
Buku Teks
Dinniss, Heather Harrison, author
Cambridge University Press, 2012
Buku Teks
Bryant, John
Cornel Univ. Press, 1969
Buku Teks