The Universal Postal Union (UPU) was formed in 1874 and is the primary means of cooperation between postal services of all the nations of the world.
Malaysia joined the Postal Union 17.01.1958 as Federation of Malaysia.
Len Stanway, Malaysia and The Federation of Malaya – their stamps and postal stationery (The Malaya Study Group 2010) Volume 1: Malayan Union postage due labels from 1936 onwards, Volume 2
Malaya and the Colour Scheme of the Universal Postal Union (Part 1&2)
Rob Holley, G.S.M. January 2011
Mai 2015 – The Website Singapore 2015 – The World Stamp Exhibition present “The Colour Scheme of the Universal Postal Union and its effect on Postal Stationery Post Cards issued by the Federated Malay States”
Malayan Postal Union – Postage Due Stamps
1936 – 1938 Watermark Mult
1945 – 1949 New Values and Colours, Watermark Mult.
14.04.1964 Watermark Block CA
00.01.1965 10c overprinted on 8c stamp