Gaya APA

Alexander, L, G. (1970). Practice and Program Supplementary Written Exercises: New Concept English (Cet. 1.--). Inggris: Longmans.

Gaya MLA

Alexander, L., G.. "Practice and Program Supplementary Written Exercises: New Concept English". Cet. 1.-- Inggris: Longmans, 1970. Text.