Tilbury, Alex
English unlimited : B2 upper intermediate coursebook with e-portfolio
Cambridge University Press, 2011
 Buku Teks SO
English unlimited : elementary e-portfolio DVD-ROM
Cambridge University Press, 2010
 Multimedia
Doff, Adrian
English unlimited : C1 Advanced coursebook with e-Portofolio
Cambridge University Press, 2011
 Buku Teks SO
English unlimited : B1 Pre-intermediate coursebook
by Alex Tilbury ... and others]
Cambridge University Press, 2012
 Buku Teks SO
English unlimited : A2 Elementary teacher's pack
Cambridge University Press, 2010
 Buku Teks SO