Welling, W. (1976). Collector's guide nineteenth-century photographs. Collier Books.
Lua i Stíl Chicago (17ú heag.)Welling, William. Collector's Guide Nineteenth-century Photographs. Collier Books, 1976.
Lua MLA (9ú heag.)Welling, William. Collector's Guide Nineteenth-century Photographs. Collier Books, 1976.
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