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Books about Klaass:
FIRST STUDIES IN HARMONIC ANALYSIS BASED ON "RINGEL-RINGEL-REIHE" FOLK SONGS ARRANGED BY ROBERT KLAASS by ANGELA (EDITED BY) DILLER (1925)
Audiokurs k uchebniku "Angliski yazyk. VIII klaass" i rabochei tetradi dlya shkol s uglublennym izuchenie angliskogo... by Muzykal'naya gruppa: Afanas'eva (Jan 1, 2008)
Wiki information Klaass:
Davy Klaassen is a Dutch footballer who plays as an attacking midfielder for Dutch side Ajax and for the Netherlands national team.