Fonte positiva dos dados

Sec. de: A melhor amiga do urso. c2014

https://www.booktrust.org.uk/book/b/bears-best-friend: (Sarah lives, professora de Ilustração - Illustration BA Course at Kingston University)

http://authorities.loc.gov 27/8/2018: (d.n.)

http://viaf.org/processed/DNB%7C1043603131: (d.n.)

https://en.wikipedia.org/wiki/Sarah_Dyer: (ilustradora americana, nasceu na Louisiana)