Cook, John W.
Cambridge University Press , 1994
Buku Teks SO
edited by Harold Morick
McGraw-Hill, 1967
Buku Teks SO
Vincentia Irmayanti Meliono
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1986
UI - Skripsi Membership
Travis, Charles
Clarendon Press, 1989
Buku Teks SO
Vincentia Irmayanti Meliono
Maharini Press, 1997
Buku Teks SO