Não informado. (1966). Holland Herald: Newsmagazine of the Netherlands. KLM Inflight Entertainment.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Holland Herald: Newsmagazine of the Netherlands. Amsterdam: KLM Inflight Entertainment, 1966.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Holland Herald: Newsmagazine of the Netherlands. KLM Inflight Entertainment, 1966.
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