Umar Kayam, foreword
Buku Teks
Richards, Jonathan
Routledge, 1994
Buku Teks
Jennings, Ivor, Sir, 1903-1965, author
University of London Press Ltd, 1952
Buku Teks
Jennings, Ivor, Sir, 1903-1965
University of London Press , 1946
Buku Teks
Seeley, Ivor H.
Macmillan, 1995
Buku Teks