Four Heroes meet Baba-Yaga (sources)
- "Alexander Afanasyev," page in the Wikipedia website, viewed 9-23-2015. Online at: https://en.wikipedia.org/wiki/Alexander_Afanasyev
- Russian Folk-Tales, by William Ralston Shedden Ralston, 1880 R. Worthington, New York, New York, USA. pg. 153-155. Online at: https://books.google.com/books?id=LTMYAAAAYAAJ&printsec=frontcover&dq=%22Russian+Folk-Tales%22&hl=en&sa=X&ved=0CCcQ6AEwAmoVChMIs5Wuq62ByAIVkVKSCh0nuQvJ#v=onepage&q=%22Russian%20Folk-Tales%22&f=false