American Belgian Philatelic Society
Belgian Congo Study Circle
Belgian Modern Philatelic Study Circle - Belmophil
BelStamps
Corneille Soeteman S.A.
David Delhaye (Auctions)
Luk Vanduffel (Auction)
Maison Williame
De Bast, J. Nomenclatuere Des Bureaux De Poste, De Belgique et du Nore de La France Occupés Guerre 1914-1918, 1990; (in Dutch and French).
De Cock, Andre. [Belgian Congo] Le Congo Belge et ses Marques Postales, 1986 reprint of 1931 book; (in French).
De Grave. Les cachets "Ambulant" de la Belgique occupée 1914-1918, 1977; (in French).
Degreef, Albert. [Belgium Post Offices], Dictionnaire Des Bureaux De Poste De Belgique de 1830 - 1983, 1985; (in French with English
supplement).
Gudenkauf, Abbe G. [Belgian Congo] Mailboat Steamers on Congo Rivers and Lakes 1896-1940, Cockrill Booklet, 1985.
Gudenkauf, Abbe G. [Belgian Congo]' Postal History of the Lado Enclave 1897-1910, Belgian Congo Study Circle, Cockrill Booklet 44,1986.
Gudenkauf, Abbe. Mailboat Services from Europe to the Belgian Congo 1879-1922, Belgian Congo Study Circle, 1983.
Hanciau, Louis. La Poste Belge et ses Diverses Marques Postales de 1814 a 1914, 1981 reprint of 1929 book.
Herlant. Les Marques Postales Prephilateliques De La Belgique, 1982.
Koopman H. Belgium Cancellations, English translation by A. De Lisle:
Koopman H. Belgium Cancellations, English translation by A. De Lisle: Les cachets a barres de Belgique 1849-1864, [horizontal and vertical
bar killers], 1975; (in Dutch and French).
Koopman H. Belgium Cancellations, English translation by A. De Lisle: De Puntstempels van Belgie 1864-1873, [priced catalogue of the
dotted killers, and the travelling post offices], 1982; (in Dutch and French).
Koopman H. Belgium Cancellations, English translation by A. De Lisle: Les Obliteratins a Double Cercle 1873-1876, 1984; (in French).
Koopman H. Belgium Cancellations, English translation by A. De Lisle: Les cachets a simple cercle de Belgique 1873-1910, [single circle
postmarks], 1977; (in Dutch and French.)
Koopman H. Belgium Cancellations, English translation by A. De Lisle: Les Obliterations Des "Depots" 1879-1910, [Post Offices
with Limited Service], 1977; (in Dutch and French).
Koopman H. Belgium Cancellations, English translation by A. De Lisle: Les oblitérations sur l'émission de 1893, 1979; (in French).
Leroy, Robert. Bibliografie van de filatelie in Belgie, 1988 second edition.
Lurch, E. Norman. Belgian Colonies Postal Stationery, 1989.
Silverberg, René. Censure et Postes Militaires Belges 1914-1929, 1982, 2nd edition.
Silverberg, René. La Poste Belge Durant la Guerre de 1914-1919, [Belgian civil postal system and stamps during WW I]. 1976; (in French).
Silverberg, René. Les Oblitératins Mécaniques de Belgique de 1905 a 1920, [Belgium Machine cancellations], 1988; (in French).
Unknown, Les Chevaliers du timbre (De Ridders van de postzegel), [German invasions of Belgium], 1985; (in French).
Van Riet, Willy, [Belgium] Catalogue of Postmarks in Use During the German Occupation, 1914-1918, 1982; (in English, French and German).