Siepmann, Otto
Macmillan, 1908
Buku Teks SO
Smith, Kevin
Westview Press, Boston, Massachusetts : Credo Reference, 2013
Buku Teks SO
edited by Anthony Hopwood and Cyril Tomkins
Philip Allan, 1984
Buku Teks
Jones, Rowan
Financial Times, Prentice-Hall, 2010
Buku Teks
Starling, Grower
Wadsworth and Cengage Learning, 2011
Buku Teks