P.K. Hallinan is the author and illustrator of 90 published children's books, with over 9 million copies sold worldwide. His most famous book is "How Do I Love You?" which has sold two million copies to date.
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"P.K. Hallinan Quotes." Quotes.net. STANDS4 LLC, 2017. Web. 20 Feb. 2017. <http://www.quotes.net/authors/P.K.+Hallinan>.