- https://cyberleninka.ru/article/n/russkie-skazki-na-syuzhet-tri-podzemnyh-
tsarstva-v-sibirskom-repertuare (дата обращения: 24.09.2021). (In Russian) Терещенко...
- Grebelskii, V. V. Lapin.
Dvorianskie Rody
Rossiiskoi Imperii: Kniazʹia
Tsarstva Gruzinskogo. IPK
Vesti (1994). ISBN 978-5-86153-005-7.
Aleksandr Prokhorov...
- https://cyberleninka.ru/article/n/russkie-skazki-na-syuzhet-tri-podzemnyh-
tsarstva-v-sibirskom-repertuare (дата обращения: 24.09.2021). (In Russian) Терещенко...
- Gumilev, L. N. (Lev Nikolaevich), 1912-1992. (2002).
Poiski vymyshlennogo t︠s︡arstva :
legenda o "Gosudarstve
presvitera Ioanna". Moskva: Aĭris-Press. ISBN 5811200218...
- 129–134. doi:10.2307/1217531. JSTOR 1217531. Takhtajan, Armen. 1973.
Chetyre tsarstva organicheskogo mira (Four
Kingdoms of the
Organic World).
Priroda (Nature)...
- Gumilev, L. N. (Lev Nikolaevich), 1912-1992. (2002).
Poiski vymyshlennogo t︠s︡arstva :
legenda o "Gosudarstve
presvitera Ioanna". Moskva: Aĭris-Press. ISBN 5811200218...
-
Tsardom (Russian: Летописец Начала Царства, romanized: Letopisets
Nachala Tsarstva) –
chronicle of
events of 1533–1552, i.e. the
beginning of Ivan's reign...
