A、He doesn’t need books as references for his research project. B、He doesn’t agree with the professor on the source of reference

M: Excuse me, what’s the difference between the regular subway ticket and the seven-day pass?
W: Well.it costs you only 17 dollars to get a seven-day pass, and you get unlimited use during the whole week. However, the regular admission is 1. 5 dollars per trip.
Q: What do we learn from the conversation?

W: Well,you can try the card catalog if you want to find books for your research project.
M: The professor said that we shouldn’t use just books as references for our papers. We should also use journal articles as references. Would I find those in the card catalog too?
Q: What does the man mean?