public Book(string isbn, string name, PublishingHouse publisher, List <Author> authors)
{
Id = Guid.NewGuid();
Isbn = isbn;
Name = name;
Publisher = publisher;
this.authors = authors;
}
internal Book(Guid id, string isbn, string name, DateTime publishedOn, PublishingHouse publisher, List <Author> authors)
{
Id = id;
Isbn = isbn;
Name = name;
PublishedOn = publishedOn;
Publisher = publisher;
this.authors = authors;
}