De clavium potestatis existentia atque natura : dissertatio / quam submitti Ambrosius Villalpando
. – Washingtonii, D.C. : Universitatis catholica Americae, 1921
. – vii, 140 p. ; 23 cm
. – (Universitas Catholica Americae Washingtonii. S. Facultas Theologica. [Studies in sacred theology] ; 16)