Rasmussen, A., & Migiel, M. (1991). Francesco Petrarca, [Uber die Grisel. Ulm: Johann Zainer, 1474 or 1475], Rosenwald Collection 50; Goff P-404. In Visions of a Collector: The Lessing J. Rosenwald Collection (pp. 68–70). Washington,.D.C.: The Library of Congress.

Rasmussen, A., and Marilyn Migiel. “Francesco Petrarca, [Uber die Grisel. Ulm: Johann Zainer, 1474 or 1475], Rosenwald Collection 50; Goff P-404.” In Visions of a Collector: The Lessing J. Rosenwald Collection, 68–70. Washington,.D.C.: The Library of Congress, 1991.

Rasmussen A, Migiel M. Francesco Petrarca, [Uber die Grisel. Ulm: Johann Zainer, 1474 or 1475], Rosenwald Collection 50; Goff P-404. In: Visions of a Collector: The Lessing J Rosenwald Collection. Washington,.D.C.: The Library of Congress; 1991. p. 68–70.

Rasmussen, A., and Marilyn Migiel. “Francesco Petrarca, [Uber die Grisel. Ulm: Johann Zainer, 1474 or 1475], Rosenwald Collection 50; Goff P-404.” Visions of a Collector: The Lessing J. Rosenwald Collection, Washington,.D.C.: The Library of Congress, 1991, pp. 68–70.

Rasmussen A, Migiel M. Francesco Petrarca, [Uber die Grisel. Ulm: Johann Zainer, 1474 or 1475], Rosenwald Collection 50; Goff P-404. Visions of a Collector: The Lessing J Rosenwald Collection. Washington,.D.C.: The Library of Congress; 1991. p. 68–70.