Шаблон:Watkins
Calvert Watkins. The American Heritage® Dictionary of Indo-European Roots. — 3-е. — 2011. — 192 с. — ISBN 978-0547549446.
Calvert Watkins. The American Heritage® Dictionary of Indo-European Roots. — 3-е. — 2011. — 192 с. — ISBN 978-0547549446.