Francoeur, Robert T.; Noonan, Raymond J. (2004). The Continuum Complete International Encyclopedia of Sexuality. A&C Black. стр. 361. ISBN9780826414885. „The dominant religion in Estonia is Evangelical Lutheranism. Estonians were Christianized by the Teutonic Knights in the 13th century. During the Reformation, Lutheranism spread, and the church was officially established in Estonia in 1686.”
Laansalu, Ants (9. 10. 2009). „Crisis in agriculture in the 1990s”. The rural economy in Estonia until 2001. Estonica. Архивирано из оригинала 16. 03. 2017. г. Приступљено 15. 3. 2017.
Laansalu, Ants (9. 10. 2009). „Crisis in agriculture in the 1990s”. The rural economy in Estonia until 2001. Estonica. Архивирано из оригинала 16. 03. 2017. г. Приступљено 15. 3. 2017.