Cita APA (7a ed.)

(1976). Steps to spoken english: A graded course for spanish-speaking students 3 (3a. ed.). Longman.

Cita Chicago Style (17a ed.)

Steps to Spoken English: A Graded Course for Spanish-speaking Students 3. 3a. ed. Buenos Aires: Longman, 1976.

Cita MLA (8a ed.)

Steps to Spoken English: A Graded Course for Spanish-speaking Students 3. 3a. ed. Longman, 1976.