Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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