Website and communities:
- Mr Sadri is an Iranian philately scholar and expertizer.
- Iran Philatelic Study Circle (IPSC) is a community for studying Iranian philately. They have a lot of resources available to their members and a forum to answer members' questions.
Books:
- Mr Sadri's books and catalogs
- Dr Goodarzi books
- Mr Mossavar-Rahmani book on postmarks of Qajar era
- Mr Mossavar-Rahmani book on censorship and control markings of Qajar era