(in English) J[ens]. P[eter]. Jacobsen, author, and Hanna Astrup Larsen, translator, Marie Grubbe: a Lady of the Seventeenth Century (New York: The American-Scandinavian Foundation, 1917), p. 257
(in Danish)C[arl]. F[rederik]. Bricka and J[ulius]. A[lbert]. Fridericia, Kong Christian den fjords egenhændige breve, Bind 3, 1632-1635 [Handwritten Letters of King Christian the Fourth, Volume 3, 1632-1635] (Copenhagen: Rudolph Klein, 1878-1880), pp. 314-315
(in Danish) Birket-Smith, Otto Sperlings Selvbiografi, 1602-1673, pp. 94 ff.
(in English) Asta Bredsdorff, The Trials and Travels of Willem Leyel: An Account of the Danish East India Company in Tranquebar, 1639–48 (Copenhagen: Museum Tusculanum Press, 2009), ISBN978-87-635-3023-1page 63.