APA Style

Warning: Undefined variable $authors_string in /var/www/univlia/slims/template/default/citation/apa_style_template.php on line 21
Principles of language learning and teaching. (). White Plains, NY :: Pearson Longman.

MLA Style

Warning: Undefined variable $authors_string in /var/www/univlia/slims/template/default/citation/mla_style_template.php on line 21
Principles of language learning and teaching. 5th ed.. White Plains, NY :: Pearson Longman, . Text.