Stamps in 2013

Putevi postanske marke by Despotovic, Dragan

Katalog postanskih maraka 1991. - 2006.: Jugoslavije i drzavne zajednice Srbije i Crne Gore by Despotovic, Dragan

New Hebrides Postal Rates, Postmarks, Registration Cachets/Labels by Klinger, Roland, Goyns, Malcolm H.

History of Britain in Thirty-six Postage Stamps by West, Chris

Kinds of Postage Stamps & Ways of Collecting Them by Morrison, Donald F.