APA

(1992). Longman active study dictionary of English. London: Longman Group uk limited.

Chicago

1992. Longman active study dictionary of English. London: Longman Group uk limited.

Harvard

(1992). Longman active study dictionary of English. London: Longman Group uk limited.

MLA

Longman active study dictionary of English. London: Longman Group uk limited. 1992.