edited by C. Eugene Walker ; consulting editors, Frederick Kanfer ... [and others]
Dow Jones-Irwin, 1983
Buku Teks SO
edited by Martin E. Liggins, David L. Hall, James Llinas
CRC Press, 2009
Buku Referensi
Searles, William H.
John Wiley & Sons, 1949
Buku Referensi
Armstrong, Michael
Kogan Page Limited, 1995
Buku Referensi
edited by John S. Dryzek, Bonnie Honig, Anne Phillips
Oxford University Press, 2008
Buku Referensi