I am beginning Chinese speaker, but I watch this documentary on Chinese characters and they talk about origins of the characters from ideograms. They refer to a book called "Roots of Characters" but I cannot find it. Instead using Chinese Characters 汉说文 I find a website with some information: http://shuowen.xpcha.com/03ch6de8uu4.html Here is the entry for: 水 (shui : water)
What is the English name of this book? Is there a reliable online resource?