IEF课本问题

请问各位本科IEF都需要什么书？听说买原书实在太贵，有的用处也不大，那应该怎么弄到便宜的书呀？？

自己复印或者买二手书 很多书还是很有价值的 值得收藏

能告诉我一下课本的名称吗？

looking back on those courses and testbooks, based on what i wanna do and what i'm doing, I think allmost all textbooks (more than 70% of pages remained untouched ) are holy XXXX but not financial accounting and corporate finance.