Martinus Nijhoff , 1987
Buku Teks
Council of Europe
Martinus Nijhoff Publishers, 1990
Buku Referensi
Robertson, Arthur Henry, 1913-, author
Manchester University Press, 1993
Buku Teks
Duranti, Marco, author
Oxford University Press, 2017
eBooks
Edmunds, June, 1961-, author
Routledge, Taylor & Francis Group, 2017
Buku Teks