Harmer, Jeremy Essential teacher knowledge core concepts in english language teaching/ Jeremy Harmer. - Harlow : Pearson Longman 2012 - 287p. :ill. ( some col. & pic ) 28 cm. ISBN: 9781408268049 LC Class. No.: PE1128.A2 H343 2012 Dewey Class. No.: PE1128.A2 H343 2012 National Library of Medicine Call No.: PE1128.A2 H343 2012