Platt, John
English in Singapore and Malaysia: status, features, functions / John Platt and Heidi Weber
Oxford University Press, 1980
 Buku Teks
Hoskins, R.F.
Generalised functions
Ellis Horwood, 1979
 Buku Teks
Dodge, Clayton W.
The circular functions
Prentice-Hall, 1966
 Buku Teks
Bernard, Chester I.
The functions of the executive
Harvard University Press , 1966
 Buku Teks
Maslov, Yevgeny
Russian federation
Moscow Foreign Languages Publishing House 1960
 Buku Teks