1.
Detailed information of new issues : Flemish tapestries third issue
2.
Manual of the stamps of Netherlands
The postal history of the grand duchy of Luxembourg
Holland
Netherlands Centenary Philatelic Exhibition, January 26-February 18, 1952.
The Melite Post : Issue No. 4 : September 2017
Detailed information of new issues : Flemish tapestries 2
Gozo Philatelic Society Newsletter : no. 32 : April-June 2008
Advertising and the Belgian post office : part 1
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5.
Gozo Philatelic Society Newsletter : no. 63 : January-March 2016