APA
(19701969). Modern world mathematics # Modern world mathematics-4. London: Longman Group Limited.
Chicago
19701969. Modern world mathematics # Modern world mathematics-4. London: Longman Group Limited.
Harvard
(19701969). Modern world mathematics # Modern world mathematics-4. London: Longman Group Limited.
MLA
Modern world mathematics # Modern world mathematics-4. London: Longman Group Limited. 19701969.