Disputatio juridica inauguralis de causis obligationum, quam praeside tri-uno Deo, ex auctoritate magnifici d. rectoris, d. Joh. Friderici Bockelmanni, ... pro gradu doctoratus ... publico examini subjicio Joannes D.F. van Alphen ... in a.d. 23. Febr. loco horisque solitis