Winship, M. (1986). Hermann Ernst Ludewig: America's forgotten bibliographer : a lecture : 16 December 1985, the first Sol M. Malkin lecture in bibliography. New York: Book Arts Press, School of Library Service, Columbia University.

Winship, Michael. Hermann Ernst Ludewig: America's Forgotten Bibliographer : A Lecture : 16 December 1985, the First Sol M. Malkin Lecture in Bibliography. New York: Book Arts Press, School of Library Service, Columbia University, 1986.

Winship, Michael. Hermann Ernst Ludewig: America's Forgotten Bibliographer : A Lecture : 16 December 1985, the First Sol M. Malkin Lecture in Bibliography. New York: Book Arts Press, School of Library Service, Columbia University, 1986.