For this actual bear see The Teddy Bear Encyclopedia, by Pauline Cockerill, page 22.
The Teddy Bear Hall of Fame - a Century of Historic Bears, by Michele Brown, page 46.
The Ultimate Teddy Bear Book, by Pauline Cockerill, page 24 where he is known as Maximilian.
The Teddy Bear Museum - The Official Guide, cover.
The Little History of the Teddy Bear, by Michele Brown, pages 51 and 57.