Update preface.md

2018-02-22 12:57:20 +08:00 · 2018-02-22 12:57:20 +08:00 · 3587f6a931
parent 9689a66054
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--- a/preface.md
+++ b/preface.md
@ -18,6 +18,7 @@ Go语言圣经 [《The Go Programming Language》](http://gopl.io) 中文版本
 - http://2goo.info/media/html/gopl-zh-gh-pages/
 - http://docs.plhwin.com/gopl-zh/
 - https://docs.hacknode.org/gopl-zh/
+- http://books.studygolang.com/gopl-zh/

 {% include "./version.md" %}