Halliday, Jon
Pantheon Books, 1975
Buku Teks SO
Adams, T.F.M.
Kodansha International, 1969
Buku Teks
Walter, John
Oxford University Press, 2017
eBooks
edited by Arthur S. Banks, Alan J. Day, Thomas C. Muller
CSA Publications, 1997
Buku Referensi
Brogan, D.W. (Denis William)
Harcourt, Brace & World, 1963
Buku Teks SO