APA (7th ed.) Citation

Newbold, W. R., & Kent, R. G. (1928). The cipher of Roger Bacon. University of Pennsylvania Press [u.a.].

Chicago Style (17th ed.) Citation

Newbold, William Romaine, and Roland Grubb Kent. The Cipher of Roger Bacon. Philadelphia: University of Pennsylvania Press [u.a.], 1928.

MLA (9th ed.) Citation

Newbold, William Romaine, and Roland Grubb Kent. The Cipher of Roger Bacon. University of Pennsylvania Press [u.a.], 1928.