Self-regulation frame found while serializing data models in MVC5 / EF6

I am getting this "Self Regulating Loop Detected" error when serializing using Json.NET

I have a model book

public class Book
{
    public Book()
    {
        BookPersonMap = new List<BookPersonMap>();
    }

    public int BookId { get; set; }

    public virtual ICollection<BookPersonMap> BookPersonMap { get; private set; }

    (And many other virtual Icollections)
}

      

        
        
        
      

    

And this is the BookPerson display class:

public class BookPersonMap
{
    public int BookId { get; set; }

    public string PersonName { get; set; }

    public int PersonTypeId { get; set; }

    public virtual Book Book { get; set; } // Foreign keys

    public virtual PersonType PersonType { get; set; }
}

      

        
        
        
      

    

When I try to Serialize the Book object, it throws:

"Self referencing loop detected for property 'Book' with type 'System.Data.Entity.DynamicProxies.Book_57F0FA206568374DD5A4CFF53C3B41CFDDC52DBBBA18007A896 08A96E7A783F8'. Path 'BookPersonMap[0]'."

I have tried things suggested in some similar posts Example:

• PreserveReferencesHandling = PreserveReferencesHandling.Objects in Serializer preferences returns 3 million string!

• ReferenceLoopHandling = ReferenceLoopHandling.Ignore in Serializer settings: "An exception of type 'System.OutOfMemoryException' occurred in Newtonsoft.Json.dll but was not handled in user code"
  
  

• ^ Same luck with "ReferenceLoopHandling.Serialize"

• MaxDepth = 1 : endless loop again.

Putting [JsonIgnore] on virtual properties works, but it's a tedious task (due to multiple FK references) and inefficient because if I missed one property and throw an exception.

What's missing in Json settings for them, not working?