Ukers, William H (1922). "The Introduction of Coffee into Holland". All About Coffee. New York: Tea and Coffee Trade Journal. ISBN0-8103-4092-5. Archived from the original on 5 September 2010. Retrieved 12 February 2010.
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Ukers, William H (1922). "The Introduction of Coffee into Holland". All About Coffee. New York: Tea and Coffee Trade Journal. ISBN0-8103-4092-5. Archived from the original on 5 September 2010. Retrieved 12 February 2010.