O`Driscoll, Gerald P.
Routledge, 1996
Buku Teks SO
Friedman, Milton, 1912-2006
Harcourt Brace Jovanovich, 1984
Buku Teks SO
Bullock, Alan
Harper and Row, 1962
Buku Teks SO
Chase, Stuart
Harcourt, Brace, 1938
Buku Teks
Siti Aisah Masjkoer
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1971
UI - Skripsi Membership