Well, yes, but even my teachers in high school would not accept a forum or websites as a source. As far as equine color goes there really are not a lot credible sources out there that a professor/institute would deem acceptable. Unless you have access to online journals/periodicals - which unfortunately you have to pay for unless your school provides you with access.
The registry, however, is still a database with mostly accurate information.
I'm only emphasizing this part so her bibliography is admissible.
However, that has been my experience because my profs are rather laid back.