Flipkart.com: Handbook Of Means And Their Inequalities: P. S. Bullen, Dragoslav S. Mitrinovic, M. Vasic: Books Buy Mitrinovic Vasic Mean in India

Amazon.com: Handbook of Means and Their Inequalities (Mathematics and Its Applications) (9781402015229): P.S. Bullen: Books

Powell's Books - Handbook of Means and Their Inequalities by P. S. Bullen

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Flipkart and Amazon report having it in stock, Powells doesn't say anything however. Guess you'll have to enquire.

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If these links aren't what you're looking for, try this:

Probably the best place to find it