BALEJOVÁ, Martina. Vyšehradská spolupráca a perspektívy jej vývoja. - Registrovaný: Web of Science. In International relations 2014 : contemporary issues of world economics and politics. International scientific conference. International relations 2014 : contemporary issues of world economics and politics : conference proceedings : 15th international scientific conference : Smolenice Castle, 4th - 5th december 2014. - Bratislava : Publishing house EKONÓM, 2014. ISBN 978-80-225-3980-7, s. 25-35 CD-ROM.