LESÁKOVÁ, Dagmar. Age in shopping behaviour. In 1st International M-Sphere conference for multidisciplinarity in science and business : book of proceedings, part 1 : 4th-6th October 2012, Dubrovnik, Croatia. - Dubrovnik : Accent, 2012. ISBN 978-953-7930-00-4, pp. 307-311. VEGA 1/0612/12. Available on Internet: <https://issuu.com/tvranes/docs/book_of_proceedings_part_1/315>
<https://www.m-sphere.com.hr/book-of-papers>