Gosling, Samuel; Graham, Lindsay (2009-04-28), "Temperament and Personality in Working Dogs", Canine Ergonomics, CRC Press, pp. 63–81, doi:10.1201/9781420079920.ch4, ISBN9781420079913
Photos here [1]Archived 2012-12-26 at the Wayback Machine. They are also published in Richard Wolters' book The Labrador Retriever according to that site.
Photos here [1]Archived 2012-12-26 at the Wayback Machine. They are also published in Richard Wolters' book The Labrador Retriever according to that site.
