British Council. (1970). Steps to spoken english: A graded course for spanish-speaking students (1a. ed.). Longman.
Citace podle Chicago (17th ed.)British Council. Steps to Spoken English: A Graded Course for Spanish-speaking Students. 1a. ed. Londres: Longman, 1970.
Citace podle MLA (9th ed.)British Council. Steps to Spoken English: A Graded Course for Spanish-speaking Students. 1a. ed. Longman, 1970.
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