Nested Linq in MVC4 Razor

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C#

LINQ

Razor

MVC4

lambda

Hi all,
currently i'm facing the problem with nested linq.

here is my tables and now i am developing MVC4 Razor web application.
student
student_id,studentname,description
book
book_id,student_id,bookname,checkitout
booker
bookerid,book_id,bookername,bookerdescription

i create the model for displaying

public class student_model{
	public int student_id {get;set;}
	public string studentname {get;set;}
	public string bookname {get;set;}
}

i want to write nested LINQ for booker. so i use the following LINQ:

public List<student_model> finder (int stuid){
	var stubk = (from stu in contx.students
		join bk in contx.books on stu.student_id equals bk.student_id
		where stu.student_id == stuid
		select new {
			//here is wrong
			student = from bker in contx.bookers
				where bker.book_id=bk.book_id
				select new student_model{
					student_id = stu.student_id,
					studentname = stu.studentname,
					bookname = bk.bookname
				}	
		}).ToList();

	var next = stubk.Select(md=>md.student)

	return (List<student_model>) next;
}	

It is wrong nested LINQ. so how should i do it to make a filter bookers.book_id = bk.book_id ? and how should i return (List<student_model)?>

Thanks
frog