Dariusz R. Piwowarczyk (2014). «The Proto-Indo-European root for ‘apple’ and the problem of comparative reconstruction». Studia Etymologica Cracoviensia. 19 (3): 161–167. ISSN1427-8219. doi:10.4467/20843836SE.14.009.1652.
Dariusz R. Piwowarczyk (2014). «The Proto-Indo-European root for ‘apple’ and the problem of comparative reconstruction». Studia Etymologica Cracoviensia. 19 (3): 161–167. ISSN1427-8219. doi:10.4467/20843836SE.14.009.1652.