@book { PortfolioEntrepreneurshipinSlovakia,
    title = "Portfolio Entrepreneurship in Slovakia",
    subtitle = "Empirical analysis of small and medium sized enterprises",
    author = "Branislav {Zurik}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/276827"
}