Analysis of information sources in references of the Wikipedia article "Rick Riordan" in Vietnamese language version.
|= (trợ giúp)There are 30 million copies in print in the U.S. of the novels in the author's three series for Disney-Hyperion: Percy Jackson & the Olympians, The Kane Chronicles, and the The Heroes of Olympus—and the books have been translated into 37 languages.
a cruise to the Baltic and Scandinavian countries last summer provided fodder for Riordan's upcoming Norse series
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