(1970). Steps to spoken English: A graded course for spanish-speaking students. Book Four. Longman.
Chicago Style (17th ed.) CitationSteps to Spoken English: A Graded Course for Spanish-speaking Students. Book Four. London: Longman, 1970.
MLA (9th ed.) CitationSteps to Spoken English: A Graded Course for Spanish-speaking Students. Book Four. Longman, 1970.