Platt, John
English in Singapore and Malaysia: status, features, functions / John Platt and Heidi Weber
Oxford University Press, 1980
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Oriza Septiyandra
Citra positif Rusia dalam fitur belajar bahasa Rusia pada situs Russia beyond the headlines = Russian positif image in Russia beyond the headlines interactive features of learning about Russia and russian languages
2017
 UI - Makalah dan Kertas Kerja
Hoskins, R.F.
Generalised functions
Ellis Horwood, 1979
 Buku Teks SO
Dodge, Clayton W.
The circular functions
Prentice-Hall, 1966
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Swokowski, Earl W.
Functions and graphs
Prindle, Weber & Schmidt, 1984
 Buku Teks SO