The first Six Books,
together with the Eleventh and Twelfth,
also the Book of the Data corrected by R. Simson.

APA Citation

Euclid. (1781). The first Six Books: together with the Eleventh and Twelfth. Edinburgh: J. Balfour.

MLA Citation

Euclid. The First Six Books: Together With the Eleventh And Twelfth. Edinburgh: J. Balfour, 1781.

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