editors, Harold Chang ... [and others]
United Pascific International, 1983
Buku Referensi
McKnight, Brian E.
University of Chicago Press, 1971
Buku Teks
Artikel Jurnal
Lary, Diana
Cambridge University Press, 2007
Buku Teks SO
Schildt, Herbert
McGraw-Hill, 1997
Buku Teks SO