如何在django模板和表单中使用外键？

from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

from django import forms
from .models import Book

class BookForm(forms.ModelForm):
    class Meta:
        model = Book
        fields = ['title', 'author']

from django.shortcuts import render, redirect
from .forms import BookForm

def create_book(request):
    if request.method == 'POST':
        form = BookForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('book_list')
    else:
        form = BookForm()
    return render(request, 'create_book.html', {'form': form})

def book_list(request):
    books = Book.objects.all()
    return render(request, 'book_list.html', {'books': books})

<form method="POST">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">保存</button>
</form>

<ul>
  {% for book in books %}
    <li>{{ book.title }} - {{ book.author.name }}</li>
  {% endfor %}
</ul>