The four books:
Confucian Analects, The great learning, The doctrine of the mean, and The works of Mencius. With English notes and translation by James Legge.

APA Citation

Legge, J., Mencius., Confucius. (1930). The four books: Confucian Analects, The great learning, The doctrine of the mean, and The works of Mencius. With English notes and translation by James Legge. Shanghai: The Chinese Book Co.

MLA Citation

Legge, James, 1815-1897, Mencius, and Confucius. The Four Books: Confucian Analects, The Great Learning, The Doctrine of the Mean, And The Works of Mencius. With English Notes And Translation by James Legge. Shanghai: The Chinese Book Co, 1930.

Warning: These citations may not always be complete (especially for serials).