1.
Geschiedenis van het kerkgezang
2.
The German Pietists of provincial Pennsylvania, 1694-1708 ; German Pietists of provincial Pennsylvania
De Souterliedekens : bijdrage tot de geschiedenis der oudste Nederlandsche Psalmberijming
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4.
5.
The Pennsylvania-German in the Revolutionary War, 1775-1783
Der gute Draht zum Nachbarn : Die deutsch-niederländische Kooperation im Telegrafenwesen ihrer Kolonien und Interessensphären im Pazifischen Raum 1899-1936
6.
7.
8.
The German immigrant in Pennsylvania before and during the Revolution ; and, Walter Jacob Hoffman being papers read before the Lehigh County Historical Society
Hymnology of the Reformed Dutch Church
Falckner's Curieuse Nachricht von Pensylvania : the book that stimulated the great German immigration to Pennsylvania in the early years of the XVIII century
Kartini: The Complete Writings 1898-1904
Acta Poloniae Historica T. 120 (2019), Studies ; Knights in the Middle Dutch Epos ‘Karel Ende Elegast’