Institute of marketing and sales management. (1961). Manuel of sales management. Sir Issac Pitman and Sons.
শিকাগো স্টাইলে সাইটেশনInstitute of marketing and sales management. Manuel of Sales Management. London: Sir Issac Pitman and Sons, 1961.
এমএলএ সাইটেশনInstitute of marketing and sales management. Manuel of Sales Management. Sir Issac Pitman and Sons, 1961.
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