Map collectors' circle, no. 46. (1968) Claes Jansz. Visscher, T. Campbell p. 3 (Claes Jansz. Visscher is father of Nicolas Jansz. I, 1618-1679 and grandfather of Nicolas Jansz. II, 1649-1702) p. 5 (maps were published and reissued by C.J. Visscher the eldest; Claes being short for Nicolas)
Koeman, C. atlantes Neerlandici, 1969 v. 3, p. 150 (Claes Jansz. Visscher or N.J. Piscator, 1587-1652) p. 161 N.I. Piscatorem)
Lister. How to identify old maps, 1965 p. 241 (Visscher (Piscator), Nikolaus Joannis or Claes Jansz., 1587-1637, cart., pub., Dutch)