Elkin, A. P.
The Australian Aborigines : how to understand them
Angus and Robertson, 1966
 Buku Teks
Elkin, A. P.
The Australian aborigines : how to understand them
Angus and Robertson, 1956
 Buku Teks
McKay, William R.
Legal English : how to understand and master the language of law
Pearson Education , 2011
 Buku Teks
Marshall, Peter
Grolier business library: how to understand finance at work
Glorier International, 2001
 Buku Referensi
Communicative language testing : How teachers understand and apply it in constructing test items
 Artikel Jurnal