Rogowski, Krzysztof
Task, 2018
Artikel Jurnal
edited by Michael B. Gregg
Oxford University Press, 2002
Buku Teks
Seelye, Elwyn E.
New York: John Wiley & Sons, 1954
Buku Teks
Barrett, William E.
Popular Library, 1962
Koleksi Publik
Azwar Effendy
2008
UI - Skripsi (Open)