The World Bank, 2008
Buku Teks
edited by Thomas A. Sebeok
Mouton, 1971
Buku Referensi
Esacove, Anne, author
Oxford University Press, 2016
eBooks
by Michael Cichon ... [and others]
International Labour Office, 1999
Buku Teks
Mertz, Robert Anton
Westerview Press, 22 cm
Buku Teks