"Kroon, Ciro D."Amigoe di Curacao (in Dutch). 3 March 1971. Retrieved 14 February 2022.
"De candidaten van de Democratische Partij". De West (in Dutch). 6 August 1945. Retrieved 14 February 2022. De West notes that at least 5 of the 8 candidates including Kroon are Freemasons
"Curaçao". Amigoe di Curacao (in Dutch). 6 November 1945. Retrieved 14 February 2022.