APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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