JANOK, Michal et al. Ceny a cenová stratégia. Bratislava : MIKA-Conzult, 2007. 190 s. ISBN 978-80-968504-3-3. [Copy count : 8, currently available 4, at library only 3]

GONDA, Vladimír. Vrtuľníkové peniaze. In Problems and Prospects of Territories’ Socio-Economic Development. International Scientific Conference. Problems and Prospects of Territories’ Socio-Economic Development : Conference Proceedings of the 7th International Scientific Conference : April 4 - 7, 2018, Opole, Poland. - Opole : Publishing House WSZiA, 2018. ISBN 978-83-62683-25-3, s. 28-30 online. VEGA 1/0246/16.