Whitney, Norman <br/><br/>
Open doors :  student's book 1A / 
 Open doors :  student's book 1B 
Norman Whitney 
 - Oxford :  Oxford University Press,  c1995 
 - 2 v. :  col. ill. ;  30 cm. 
<br/><br/><label>ISBN: </label>0194356280 (v.1) 978019435628 (v.1) 0194356299 (v.2) 978 0194356299 (v.2) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Textbooks for second language learners<br/>English language--Textbooks for foreign speakers