Cita APA (7th ed.)

British Council. (1970). Steps to spoken english: A graded course for spanish-speaking students (1a. ed.). Longman.

Cita Chicago (17th ed.)

British Council. Steps to Spoken English: A Graded Course for Spanish-speaking Students. 1a. ed. Londres: Longman, 1970.

Cita MLA (9th ed.)

British Council. Steps to Spoken English: A Graded Course for Spanish-speaking Students. 1a. ed. Longman, 1970.