British Broadcasting Corporation , 1979
Buku Teks
Aisha Ayu Syahputri
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2011
UI - Skripsi (Open)
Coase, R.H.
Longmans Green, 1950
Buku Teks
edited with introductions, bibliographies, and notes by John Wilson Bowyer and John Lee Brooks
Appleton, 1938
Buku Teks
Beer, Samuel H.
Alfred A. Knopf, 1966
Buku Teks