British Science Guild. A catalogue of british scientific and technical books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBritish Science Guild. A Catalogue of British Scientific and Technical Books.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBritish Science Guild. A Catalogue of British Scientific and Technical Books.
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