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Christie's Robson Lowe; Transvaal , The Major Harold Criddle Collection; 25 February 1992. 1992
De restanten en herdrukken van Transvaal ; The remainders and reprints of Transvaal 1910-1912 1998
The Transvaal Handbook, First Republic Genuine and Forged 1985
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The Encylopaedia of South African Post Offices and Postal Agencies, vol. 2 (F-M) : (Including their forerunners in the Cape, Natal, Orange Free State and Transvaal , Basutoland, Bechuanaland and Swaziland, etc.) 1987
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