1.
Štatistická ročenka Slovenskej republiky 2020 = Statistical yearbook of the Slovak Republic 2020. Bratislava : Veda, 2020. 663 s, [16] s obr príl. ISBN 978-80-224-1859-1.[1, of that borrowed 0]
Slovak Agricultural Library in Nitra
www.slpk.uniag.sk