look through:仔细查看，
例句 He looked through his note book before the exam
他考试前仔细翻阅了笔记

look up 查找，
例句 Look up the word in a dictionary
在字典里查这个词

refer to 参考，
例句 Refer to the textbook to get the solution
参考教材获得解答

consult for，refer to ，look up区别

一、consult很少和for连用，1. 作为不及物动词时经常和with连用，If she had had a plan, she would have consult with an expert.如果她以前有这样的计划，她当时也就会找专家商量，2. 作为及物动词时，conulst someone +句子，I have to consult my lawyer about the matter.关于这个问题我得咨询律师的意见。
二、refer to 一般指涉及，与什么相关。He never referred to his sisters in his letters. 他在信里从未提到过他的姊妹。在法律文件中常用，Refer to the abovementioned letter I have some views.
三、look up 一般是查找字典、文献或资料等等。