These are various documents, aside from Ken's own work, related to the history and practice of fencing.

Advice from a Spanish physician to his sons studying in Toulouse (1315, translated from the Latin)

Henry Eckford, "Fencing and the New York Fencers." The Century 33:56 (1887): 417–421

"On the Foil and the Épée" by Alexandre Coudurier (1904, French and English)

Zanutto, D. Luigi. Fiore di Premariacco ed I Ludi e Le Feste Marziali e Civili in Friuli. Udine, 1907.

Some instruction on How Not to Fence from the 1950s (movie format)