Citazione Stile APA (7a Edizione)

Selway, M. (1968). Steps to spoken English: A graded course for Spanish-speaking students (Rev. ed.).

Citazione stile Chigago Style (17a edizione)

Selway, Martina. Steps to Spoken English: A Graded Course for Spanish-speaking Students. Rev. ed. London, 1968.

Citatione MLA (9a ed.)

Selway, Martina. Steps to Spoken English: A Graded Course for Spanish-speaking Students. Rev. ed. 1968.