Macmillan, 1970
Buku Teks SO
Artikel Jurnal
edited by William J.Hardcastle and John Laaver
Blackwell Publishing, 1999
Buku Teks SO
William J. Hardcastle, John Laver, Fiona E. Gibbon, editor
Wiley-Blackweell, 2013
Buku Teks SO
Harrington, Jonathan, 1950-
Wiley-Blackwell, 2010
Buku Teks SO