(1999). Donald Frederick and Mildred Topp Othmer: A commemorative of their lives and legacies. Chemical Heritage Foundation.
Chicago-Zitierstil (17. Ausg.)Donald Frederick and Mildred Topp Othmer: A Commemorative of Their Lives and Legacies. Philadelphia: Chemical Heritage Foundation, 1999.
MLA-Zitierstil (9. Ausg.)Donald Frederick and Mildred Topp Othmer: A Commemorative of Their Lives and Legacies. Chemical Heritage Foundation, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.