Ross, Janet
Writing english : a composition text in english as a foreign language
Harper & Row , 1965
 Buku Teks SO
The use of english instructional media for students of the elementary school
 Artikel Jurnal
Doff, Adrian
English unlimited : elementary e-portfolio DVD-ROM
Cambridge University Press, 2010
 Multimedia
Doff, Adrian
English unlimited : A2 Elementary teacher's pack
Cambridge University Press , 2010
 Buku Teks SO
English unlimited : A2 Elementary coursebook with e-Portfolio
Alex Tilbury, Theresa Clementson, Leslie Hendra, David Rea, Maggie Baigent, Chris Cavey, Nick Robinson ; consultant editor Adrian Doff
Cambridge University Press , 2012
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