Scro, Ronald. <br/><br/>
Explore our world.  Level 6,  Workbook with audio CD / 
authors, Kate Cory-Wright, Ronald Scro ; series editors, Joan Kang Shin, JoAnn (Jodi) Crandall. 
 - Boston, MA :  National Geographic Learning/Cengage Learning,  c2015. 
 - 80 p. :  ill. ;  28 cm. +  1 audio CD. 
<br/><br/><label>ISBN: </label>9781305089907 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Problems, exercises, etc.--Problems, exercises, etc.<br/>English language--Textbooks for foreign speakers.<br/>English language--Study and teaching (Primary)