その著書はせいぜい大学生といってもいいぐらいだ。の英語

Its author is little more than a college kid.

He has a large income from his books.

A college student ought to know that.

It is a book indispensable to the student.

a great book

The want of a good book is keenly felt by the student of English.

You should read books beneficial to you.

You should read such books as will benefit you.

You should read books that will benefit you.

They are just above the middle-school grade―something better than middle-school students.

What rude ways students have!

If you can write so well, it will do.

The purpose of this course is to write as many essays as possible.

He has written a large number of books.

He is a prolific author.

The book is of great value.

A dictionary is indispensable to a student

A student can not do without a dictionary.

The students of those days were used to roughing it.

His learning covers a wide range of subjects.

Those books will make a fine library.

The book has met with a favourable reception by the reading public, and gone through ten editions.

He is a self-taught man―a self-educated man.

Good books are always worth reading.

The students （used to） lord it over the land.

He takes interest in students.

I like to rough it.

That book is generally a good one which is written to meet a keenly felt want―to meet a pressing need.

This essay is written with uproariousness.

It is strange that he should pass for a scholar.