| Kaivola-Bregenhøj, Annikki 2017. Riddles and Humour. Folklore. Electronic Journal of Folklore vol. 69. Editors Mare Kõiva, Andres Kuperjanov, Eda Kalmre. Folk Belief and Media Group of Estonian Literary Museum, Tartu. doi:10.7592/FEJF2017.69.kaivola_bregenhoj |
