Attlee, Earl C.R.
Allied Publisher, 1961
Buku Teks
Sutter, Robert G
Lanham Rowan & Littlefield, 2016
Buku Teks SO
Effy Zalfiana Rusfian
UI Press, 2015
Buku Teks SO
Effy Zalfiana Rusfian
UI Press, 2015
Buku Teks SO
Zainuddin Djafar
2004
Artikel Jurnal