I would like also to politely say that this book is definitely reliable as in it each piece of info is referenced with the episode from which it comes. Moreover, it is a very popular book among who-fans, to whom the slightest error would be noticeable, and it is a culmination of over a decades research on this subject, hope this clears the matter up for you user:Ebyabe, though your point was definitely valid and I am glad to see that such things are checked. Thanks for justifying my source user:Flax5, very kind of you. Sorry I didn't reply sooner.