Heawood, E. (2003). Watermarks mainly of the 17th and 18th centuries (Facs.-Ed.). Krown & Spellman.
Chicago-Zitierstil (17. Ausg.)Heawood, Edward. Watermarks Mainly of the 17th and 18th Centuries. Facs.-Ed. Culver City, CA: Krown & Spellman, 2003.
MLA-Zitierstil (9. Ausg.)Heawood, Edward. Watermarks Mainly of the 17th and 18th Centuries. Facs.-Ed. Krown & Spellman, 2003.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.