Maerten van Heemskerck, The Piers of the Cross Vault of New St. Peter’s Basilica and the Rest of the Northern Transept of the Old Basilica. Roman Sketchbook I (1532-1536). Pen and ink on paper. Staatliche Museen, Berlin.
Maerten van Heemskerck, Rome, Old Saint Peter’s Basilica and the Vatican Palace, c. 1535. Brown pen on paper, 27.6 x 62.3 cm. Albertina, Vienna.
Maerten van Heemskerck (1498-1574): The Fall.