Citazione APA

Allen, H. B., & Campbell, R. N. (1972). Teaching English as a Second Language (2nd ed.). McGraw-Hill.

Stile di citazione Chicago

Allen, Harold B., e Russell N. Campbell. Teaching English as a Second Language. 2nd ed. Bombay: McGraw-Hill, 1972.

Citazione MLA

Allen, Harold B., e Russell N. Campbell. Teaching English as a Second Language. 2nd ed. McGraw-Hill, 1972.