|Other Retailer||Price Checked Time||Their Price in NZD||Our Price|
|Amazon UK||7 days ago||39.15||$18.21||You save $20.94|
|Amazon US||2 days ago||18.54||$18.21||You save $0.33|
Laurence and Alison Matthews are lecturers, industrial statisticians and bestselling writers who use a simple, lively style to communicate ideas. They live near Hay-on-Wye, UK, with far too many books.