"Approuvé par Sa Majesté le roi de Prusse ... À Berlin le 1. juillet 1769."
Reproduction of original from Kress Library of Business and Economics, Harvard University.
Goldsmiths'-Kress no. 10584.8.
Electronic reproduction. Farmington Hills, Mich. : Thomson Gale, 2005. Available via the World Wide Web. Access limited to licensing agreements.