Michalak-Gray, Joanna
Complete Polish
Teach Yourself , 2014
 Buku Teks
Coggle, Paul
Further German : an advanced course / Paul Coggle and Susanne Staab
NTC Publishing Group, 1994
 Buku Teks
Kurbegov, Eliane
French grammar drills
Mc Graw Hill, 2012
 Buku Teks
Weston, Marie-Therese
French verbs / Marie-Therese Weston; editor, Paul Coggle
NTC Publishing Group, 1994
 Buku Teks
Lee, Hai-young
Cho geb han gook eo mal ha gi = Speaking Korean for beginners
HollymCorp, 2006
 Buku Teks