Houghton Library. The printed book catalogue of the Houghton Library, Harvard University.
Chicago-Zitierstil (17. Ausg.)Houghton Library. The Printed Book Catalogue of the Houghton Library, Harvard University. Cambridge, Mass.
MLA-Zitierstil (9. Ausg.)Houghton Library. The Printed Book Catalogue of the Houghton Library, Harvard University.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.