Looking for a legit place for Classical Chinese grammar rules Here is an example of my problem. I came across final particle 乎 in a classical text by 孟子. I know from a short description in a unreliable resource that it is similar to 呢, 吗 and 吧。 

The thing is, I am looking for a more detailed description in a reliable resource that I can put in a list of contents for my university report. 

Can any one point me to a reliable place to read about rules of Classical Chinese?
The best reference in English is probably Pulleyblank's Outline of Classical Chinese Grammar. I don't think it is available in a digital version though, so you'll have to look up a print version.