Maligon, Jean
Seuil, 1960
Buku Teks SO
Tokyo : The Toho Gakkai, 1973-1976; 1978-1982; 1991
Majalah, Jurnal, Buletin
edited by R.J .Wilkinson
Oxford University Press, 1971
Buku Teks SO
Donatelle, Rebecca J.
Prentice-Hall, 1988
Buku Teks SO
Sheerin, Susan
Oxford University Press, 1989
Buku Teks SO