Voynich in London : biographical details from S.M. Stepniak-Krachvinskii, the London years, by D. J. Senese, 1987
and Notes on the firm of W. M. Voynich, by Herbert Garland, 1932

A Testimony on Voynich, from G. R. Allen, 1998

Some Voynich's catalogues

Voynich's exhibition in Chicago (October, 1915)

On Voynich's life and death, by one of his friend

MS 408 in Collegio Romano ? Ruysschaert and De Ricci for dummies

Villa Mondragone, Father Strickland and Voynich

From the Collegio Romano to the villa Mondragone