APA (7e ed.) Bronvermelding

(1969). Steps to spoken english: A graded course for spanish-speaking students. Longman.

Chicago (17e ed.) Bronvermelding

Steps to Spoken English: A Graded Course for Spanish-speaking Students. London: Longman, 1969.

MLA (9e ed.) Bronvermelding

Steps to Spoken English: A Graded Course for Spanish-speaking Students. Longman, 1969.

Let op: Deze citaties zijn niet altijd 100% accuraat.