@book{PoepperZoellnerThoenes2007,
  author    = {Thomas P{\"o}pper and Frank Z{\"o}llner and Christof Thoenes},
  title     = {Michelangelo, 1475 - 1564. Das vollst{\"a}ndige Werk},
  isbn      = {978-3-8228-3053-6},
  year      = {2007},
}