Johnson, S. C., & Turner, W. J. (1944). British Postage Stamps. Collins.
Lua i Stíl Chicago (17ú heag.)Johnson, S. C., agus W. J. Turner. British Postage Stamps. London: Collins, 1944.
Lua MLA (8ú heag.)Johnson, S. C., agus W. J. Turner. British Postage Stamps. Collins, 1944.
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