Citazione APA

Kernan, D. (1975). Steps to English (Teacher's ed.). McGraw-Hill.

Stile di citazione Chicago

Kernan, Doris. Steps to English. Teacher's ed. New York ; St. Louis [etc.]: McGraw-Hill, 1975.

Citazione MLA

Kernan, Doris. Steps to English. Teacher's ed. McGraw-Hill, 1975.