References Used for This Site
- Jan Bastiaanssen's Ermen Genealogy Website (in Dutch). It is a wonderfully detailed resource by someone genealogically connected to the Ermens.
- Chapters in book "Marx and Engels and the English Workers" by W. O. Henderson, 1989, Frank Cass Publisher, London and Totowa, New Jersey: Chapter 3 is "The Firm of Ermen and Engels" (pp. 32-47); Chapter 2, "Engels in Manchester" (pp. 17-31). Both chapters have many detailed footnotes.
- Book "The Life of Friedrich Engels" by W. O. Henderson, 1976, Frank Cass Publisher, London.
- Book "Friedrich Engels: A Biography" by Gustav Mayer, 1936, Alfred A. Knopf, New York.
- Man Family Website and follow links for Schwabe family (3 of whose members married into the Ermen family).