Ivanova, V. (2015-02-23). "Philately in Russia, Part 2". Russia-IC: Culture & Arts: Manners, Customs and Traditions. Russia-InfoCentre; Guarant-InfoCentre. Archived from the original on 2015-07-03. Retrieved 2015-06-21.
thefreedictionary.com
encyclopedia2.thefreedictionary.com
Владинец, Н. И. [Vladinets, N. I.] (1977). "Филателия" [Philately]. In Прохоров А. М., гл. ред. (ed.). Большая советская энциклопедия: в 30 т. (1970–1979) [The Great Soviet Encyclopedia] (in Russian and English). Vol. 27 (Ульяновск – Франкфорт) (3rd ed.). М. [Moscow]: Советская энциклопедия [Soviet Encyclopedia]. Retrieved 2015-06-08.{{cite book}}: CS1 maint: multiple names: authors list (link)
Владинец, Н. И. [Vladinets, N. I.] (1975). "Почтовые марки" [Postage stamp]. In Прохоров А. М., гл. ред. (ed.). Большая советская энциклопедия: в 30 т. (1970–1979) [The Great Soviet Encyclopedia] (in Russian and English). Vol. 20 (Плата – Проб) (3rd ed.). М. [Moscow]: Советская энциклопедия [Soviet Encyclopedia]. Retrieved 2015-06-21.{{cite book}}: CS1 maint: multiple names: authors list (link)
Прохоров А. М., гл. ред., ed. (1977). "Филателия СССР [Filateliia SSSR]" [Philately of the USSR]. Большая советская энциклопедия: в 30 т. (1970–1979) [The Great Soviet Encyclopedia] (in Russian and English). Vol. 27 (Ульяновск – Франкфорт) (3rd ed.). М. [Moscow]: Советская энциклопедия [Soviet Encyclopedia]. Retrieved 2015-06-08.
web.archive.org
Ivanova, V. (2015-02-23). "Philately in Russia, Part 2". Russia-IC: Culture & Arts: Manners, Customs and Traditions. Russia-InfoCentre; Guarant-InfoCentre. Archived from the original on 2015-07-03. Retrieved 2015-06-21.
