Hello,

You can get the books of B Com. First year from website like,

Sahitya Bhawan Publications books B com Allahabad

Or

You can also get it from your college faculty members and from your college library if they have it. Teachers usually tell the students the names of reference books to refer for the particular subject.

You can also see at some shops or bookstores of adjoining areas of your college or university from where you might get those books.

Hope that helps