Reference 34, Secret Marks and Technical Differences of the Eighth Series of Thai General Revenue Stamps.
Reference 33, Secret Marks and Technical Differences of Baht Values in the Eighth Series of Thai General Revenue Stamps.
Reference 32, Ultraviolet Light Tagging on Thai Revenue Stamps.
Reference 31, Precancels and Security Markings on Thailand General Revenue stamps.
Reference 11, Jos Sanders, Thailand Agriculture Revenues Second issue.
Reference 19A, Jos Sanders, Thailand Agriculture Revenues First issue.
Prasatporn Eksombatchai Revenue Stamps of Siam, Large Gold Collection Bangkok 2016.
Thailand: The Att (s) Surcharges of Rama V, 1889-1908. Volume 8A, 2022 By Derek Bingham.
Thai Philately, Journal of the Society for Thai Philately, 1978-2019.
Thai Revenue Stamp Checklist, Volume 8, Edition 7, 2018, by Richard Blakeney.
Reference 109. Perfins & Perforations in Thailand Revenue Stamps.
Thai Government Post Offices, Volume 1, Edition 4, 2018, by Richard Blakeney.
Thai Licensed Post Offices, Volume 2, Edition 2, 2012, by Richard Blakeney.
Thai Railroad Post Offices, Volume 3, Third Edition, 2012, by Richard Blakeney.
Registered Mail Markings, Volume 4A, Edition 3, 2012. By Richard Blakeney.
Registered Mail Markings, Volume 4B, Edition 3, 2012, by Richard Blakeney.
Money Order and other Mail Markings, Volume 5, Edition 4, 2018, by Richard Blakeney.
Thai Revenue Stamp Checklist, Volume 8, Edition 7, 2018, by Richard Blakeney.
Standard Envelopes issued by CAT & Thailand Post, Volume 9, Edition 1, by Richard Blakeney.
Government Envelopes, Unfinished and Unpublished, Volume 10, 2018. By Richard Blakeney.