Opera omnia, 1950

The New Grove Dictionary of Music and Musicians, 2001

p. I (Willaert's motets for five voices appeared in two editions in Venetian printing schops, the contens and the order of both editions are the same)

(Willaert, Adrian; motets; Motecta ... liber primus, 5 vv (Venice, 1539, enlarged 2/1550))