Jungherr, Andreas, author
Cambridge University Press, 2020
eBooks
Varughese, Shiju Sam, author
Oxford University Press, 2017
eBooks
Purwo Santoso, author
PCD Press, 2017
Artikel Jurnal
Schulz, Ernest B
[publisher not identified], 1956
Buku Teks
Arblaster, Anthony, author
Open University Press, 1987
Buku Teks