Bakan, Michael B.
McGraw-Hill, 2012
Buku Teks SO
Kramrisch, Stella, 1898-1993
The Phaindon Press, 1954
Buku Referensi
Madan, T. N.
Sage, 2011
Buku Teks SO
Butler, William E.
Sijthoff and Noordhoff, 1978
Buku Teks
Hall, D.G.E.
Hutchinson's University Library, 1950
Buku Teks SO