Bibliography

The British Inland Airmail April 1933 - April 1935 A. Phillips, A. Phillips, (1935)
British Air Mails: A Chronology N.C. Baldwin, Francis J. Field, (1935)
The Air Mails of the British Isles H. Stanley Redgrove, Privately Printed, (1940)
British Air Mails 1784-1946 N.C. Baldwin, Francis J. Field, (1947)
British Air Mails 1946-1951 N.C. Baldwin, Francis J. Field
Fifty Years of British Airmails N.C. Baldwin, Francis J. Field, (1960)
Great Britain Airway Letter Stamps and Services N.C. Baldwin, Francis J. Field, (1966)
The Railway and Airway Letter Stamps of the British Isles 1891-1971 Capt. H.T. Jackson, Harry Hayes (1979)
Airway Letter Stamps David Potter, The Cinderella Philatelist Volume 20, January 1980, p. 18
Official British Inland Airmails John C.W. Field. British Philatelic Bulletin, Volume 24, January-June 1987
Airway Letters of the United Kingdom Peter Lister, Published by the Author (1994)
The Story of the Airway Letter Service 1933-1988 D. Wilson, Air Mail News June 1994, pp. 14-42
The Airway Letter Service Supplementary Notes D. Wilson, Air Mail News December 1994, pp. 70-78