GRIL NACO contribution (n.d.)
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Internat'l dir. of arts, 1979/80 under art and antique dealers (Nystad Antiquairs Lochem B.V., located in Lochem and Amsterdam)
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Julius S. Held papers, ca. 1928-1998 (S. Nystad Oude Kunst N.V., Den Haag)
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Library of Congress Authorities online (2002-) http://id.loc.gov/authorities/names/n80094583
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Vier generaties Nystad, 1962 (a.e.) t.p., etc. (Nystad Antiquairs N.V., Lochem, 's-Gravenhage) p. 13 (est. 1862 by Abraham Nystad) | | | |