Clark, W. L. (1961). Spoken English for business: Buying and selling. Kaitakusha.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClark, William L. Spoken English for Business: Buying and Selling. Tokyo: Kaitakusha, 1961.
एमएलए (8वां संस्करण) प्रशस्ति पत्रClark, William L. Spoken English for Business: Buying and Selling. Kaitakusha, 1961.
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