APA

Abbs B., Freebairn I., . (1993). Blueprint. Upper Intermediate. London: Longman.

Chicago

Abbs B, Freebairn I, . 1993. Blueprint. Upper Intermediate. London: Longman.

Harvard

Abbs B., Freebairn I., . (1993). Blueprint. Upper Intermediate. London: Longman.

MLA

Abbs B, Freebairn I, . Blueprint. Upper Intermediate. London: Longman. 1993.