Okay, I'm going to try and explain this to you again.  There are a few points which you don't seem to be understanding, so I'm going to number them.
Infoboxes contain links to various sites which contain information.  For instance, an actor's infobox will often contain a link to their official web site as well as a link to their IMDb profile.  These are not meant as sources or references.  They are simply links to other reference type sites which are well known for their content as it relates to actors.  The reason that they are included is summed up on WP:EL which states in part "... information that could not be added to the article for reasons such as copyright or amount of detail, or other meaningful, relevant content..."  IMDb and IAFD go into a great amount of detail which we don't include.  This is why they are linked in the infobox.
IMDb, much like IAFD, cannot be used as a source for biographical information.  This is because there is little, if any, fact checking done for that information.  For instance, for my IMDb profile (yes, I have one and no, I will not share it with you since it has my real name), I could supply IMDb with a date of birth, ethnicity, and so on and claim to be me but they don't actually know that I am who I say I am.  The filmography on my profile though is supplied by the directors, production companies, etc. which have had me work for them on their films.  Filmographies come to IMDb from official sources.  IAFD works much the same.  Biographical information is not very well fact checked and comes from the average user/reader/whatever you want to call them.  Filmography info comes from the production companies.
You keep asking me for a source.  I don't have any other source than what is already supplied in the article.  If you go to Bitoni's article and look at the ethnicity in the infobox, you'll see a little number "2" next to it.  That number refers to a reference in the references section of the article.  When you look there, you'll see that all the references are numbered.  Click on the second reference and that is the page that is being used as a reference for her ethnicity.  The "a, b, c" that you see there means that the same source is being used for two other facts within the article.
That source is from Bitoni's publicist.  It's as credible as can be and is trusted.
There, now that I've explained all of this, do you have any questions?  If so, please explain which point you don't understand.  |(talk)