9 books • 3 series
New Gateway to English for Senior High Schools Teacher's Guide 1 (New Gateway to English)
New Gateway to English for Senior High Schools Students' Book 3 (New Gateway to English)
New Gateway to English for Senior High Schools Teacher's Guide 3 (New Gateway to English)
New Gateway to English for Senior High Schools Students' Book 1 (New Gateway to English)
New Gateway to English for Senior High Schools Students' Book 2 (New Gateway to English)