Pieter Koster

• English Made Easy Volume One
• English Made Easy Volume One : A New ESL Approach
• Compass Classic Readers: Around the World in Eighty Days (Level 4 with Audio CD)
• English Made Easy Volume Two : British Edition : A New ESL Approach
• Learning English Through Pictures
• The Adventures of Tom Sawyer (adaptation)
• English Made Easy Vol. 2
• English Made Easy Volume 2
• English Made Easy Volume One : British Edition : A New ESL Approach
• English Made Easy Volume Two : A New ESL Approach
• Hoorn in de middeleeuwen
• Reading Success 4, 2nd Edition w/MP3 Audio CD (Intermediate-level reading series with a wide range of fiction and non-fiction texts on topics from daily life to current affairs)