Pike, Kenneth L. (Kenneth Lee), 1912-2000, author
Summer Institute of Linguistics, 1957
Buku Klasik
McArthur, Tom (Thomas Burns), author
Oxford University Press, 1983
Buku Teks
Southwell, E.A., author
Longmans, Green, 1947
Buku Teks
King, Gareth, author
Routledge, 2005
Buku Teks
Swan, Michael, author
Cambridge University Press, 1992
Buku Teks