public class Book
{
    [Key]
    public int BookId { get; set; }
    public string Name { get; set; }
    public string AuthorName { get; set; }
    public int YearOfPublishing { get; set; }
    public string PublicHouseName { get; set; } ///
    public int PublicHouseId { get; set; } ///
    public LibraryType Type { get; set; }

    public virtual ICollection<PublicHouse> PublicHouses { get; set; }

    public Book()
    {
        PublicHouses = new List<PublicHouse>();
    }
}


public class PublicHouse
{
    [Key]
    public int PublicHouseId { get; set; }

    public string PublicHouseName { get; set; }

    public string Country { get; set; }

    public virtual ICollection<Book> Books { get; set; }

    public PublicHouse()
    {
        Books = new List<Book>();
    }
}

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

    [Required(ErrorMessage = "This field is Required")]
    [StringLength(15, ErrorMessage = "Must be under 15 characters")]
    public string Name { get; set; }

    public string AuthorName { get; set; }

    [Required(ErrorMessage = "This field is Required")]
    [Range(1, 2019, ErrorMessage = "Must be between 1 and 2019")]
    public int YearOfPublishing { get; set; }

    public string PublicHouseName { get; set; } //

    [Required(ErrorMessage = "This field is Required")] //
    [Range(1, 10, ErrorMessage = "Must be between 1 and 10")] //
    public int PublicHouseId { get; set; } //

}

public class PublicHouseViewModel
{
    public int PublicHouseId { get; set; }

    [Required(ErrorMessage = "This field is Required")]
    [StringLength(15, ErrorMessage = "Must be under 15 characters")]
    public string PublicHouseName { get; set; }

    [Required(ErrorMessage = "This field is Required")]
    [StringLength(15, ErrorMessage = "Must be under 15 characters")]
    public string Country { get; set; }
}

public void Create(BookViewModel bookViewModel)
{
    var book = Mapper.Map<BookViewModel, Book>(bookViewModel);
    book.Type = LibraryType.Books;
    IEnumerable<PublicHouse> publicHouses = _publicHouseRepository.GetAll(); //
    book.PublicHouseName = publicHouses.FirstOrDefault(x => x.PublicHouseId == book.PublicHouseId)?.PublicHouseName;//

    _bookRepository.Create(book);
}