(1969). Steps to spoken english: A graded course for spanish-speaking students. Longman.
Style de citation Chicago (17e éd.)Steps to Spoken English: A Graded Course for Spanish-speaking Students. London: Longman, 1969.
Style de citation MLA (9e éd.)Steps to Spoken English: A Graded Course for Spanish-speaking Students. Longman, 1969.
Attention : ces citations peuvent ne pas être correctes à 100%.