The purpose of these Interactive Units is to be an "Audio visual companion" to the "printed" textbook, providing audio and video clips to the textbook content on demand.
What you see on the screen of these units are the images of the pages of the printed version. The mistakes, typos and inconsistencies from the printed book remain.
Web access - recommended browsers: Chrome (for Windows & Mac); Safari 7 and later (Mac)
Mobile Devices - iOS (iPhone, iPad) and Android (phone/tablet) only.