Salcedo, Diego, and Kezia Feitosa. “BRAZILIAN PHILATELY MEMORY AND BIBLIOGRAPHY: An Analysis of the Rolf Harald Meyer Stamp Catalog - RHM”. Páginas a&b, Dec. 2023, pp. 267-8, http://84.247.136.72/ojsletrasX/index.php/paginasaeb/article/view/13521.