Simev, Simjon. “Хералдичкиот лав на марки - Heraldic Lion on Post Stamps”. Македонски хералд - Macedonian Herald, no. 12 (August 9, 2019): 55-60. Accessed January 28, 2022. https://heraldika.org.mk/macedonianherald/index.php/mkherald/article/view/11.