Стиль цитування APA (7-ме видання)

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

Чикаго стиль цитування (17-те видання)

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

Стиль цитування MLA (9-ме видання)

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