APA (7th ed.) Citation

Great Britain. Post Office. Philatelic Bureau. Philatelic bulletin. British Post Office, Philatelic Bureau.

Chicago Style (17th ed.) Citation

Great Britain. Post Office. Philatelic Bureau. Philatelic Bulletin. Edinburgh: British Post Office, Philatelic Bureau.

MLA (9th ed.) Citation

Great Britain. Post Office. Philatelic Bureau. Philatelic Bulletin. British Post Office, Philatelic Bureau.

Warning: These citations may not always be 100% accurate.