问题比较复杂:
1.都是对的
2.区别很大
referring to. (提及某人某事)
refer to somebody/something as (提及某人某事为...)
意思:to mention or speak about someone or something
Eg.
He likes to be referred to as 'Doctor Khee'.
第二种又分两种:
refer sb/sth to sb
意思:to send someone or something to a person or organization to be helped or dealt with (把某人某事送去给某人某组织去帮助、处理)
refer sb to sth
意思:tell someone where to find information (告诉某人到哪里去找有用信息)
参考资料:朗文字典