| The Postal Agencies in Eastern Arabia and The Gulf, Neil Donaldson, Harry Hayes Philatelic Study No. 14 - Printed by Arthur Wigley & Sons Ltd of Leeds, 1975.|
The Postal Agencies in Eastern Arabia and The Gulf (Supplement), Neil Donaldson, Bridger & Kay Guernsey Ltd of Guernsey, 1994.
Aspects of Omani Postal History, Alastair Gunn and Calvin Allen, 2002.
The Indian Postal Agencies in The Persian Gulf Area, Alan Parsons, Sahara Publications Limited London, 2001.
The Persian Gulf, Major T.L.C. Tomkins, C. London Stamp Collecting, 1950.
The Postal History of Oman 1856-1985, Ministry of P.T.T. - Sultanate of Oman, Joh. Enschede en Zonen, Haarlem, 1985.
The Postal History of Oman 1986-1990, Ministry of P.T.T. - Sultanate of Oman, Mazoon Printing Press, 1990.
The Michel Middle East Stamp Catalogue, MICHEL-Redaktion, Schwaneberger Verlag GMBH, 1999.
Scotts Standard Postage Stamp Catalogue - Countries of the World Scott Publishing Co., Amos Press, Inc, 2003.
Stanley Gibbons Simplified Catalogue - Countries of the World Stanley Gibbons Ltd of London and Ringwood, Bemrose Security Printing of London and Derby, 2002.
The History of The Postal Service in Kuwait, 1775-1959 A.N. Donaldson, Published by J.A.L. Cooper and printed by Examiner Press of Bombay, 1968.
An Introduction to India Used Abroad V.S. Dastur, Mysore Philatelics, Printing and Publishing House, 1977.
Arabian Gulf - The Neil Donaldson Collection Sale 1988, Harmers of London 1988, FotoDirect Ltd of Brighton, 1988.
The Alnis Guide to the Revenues, War Tax Issues and Cinderellas of Bahrain, Jeri Cooper, Stop Press of York, 1990.
Journal of Arabian Philately - No. 1, Mervin L. Chaplin, Chaplin Editorial Services of Sidney, Ohio, 1972.
Journal of Arabian Philately - No. 2, Mervin L. Chaplin, Chaplin Editorial Services of Sidney, Ohio, 1972.
The Arab World Philatelist - No. 4, R. Howard Courtney, Leonard A. Unes Printing Co. of Peoria, Illinois, 1979.
India Used Abroad, J.A.L. Cooper F.R.G.S., Western Printers and Publishers' Press of Bombay, 1950.
The Postal History of Abu Dhabi, Mohammad Nazimuddin of Al Ain - Abu Dhabi - U.A.E., Not issued, 2003.
Postage Stamps of Bahrain 1933-1983, Postal Directorate - Ministry of Transportation - State of Bahrain, Oriental Press of Bahrain, 1983.
Postage Stamps of the Kingdom of Bahrain 1984-2002, Postal Directorate Philatelic Bureau - Ministry of Transportation - State of Bahrain, Oriental Press of Bahrain, 2002.