Here is the consolidation of what I contributed to a similar thread, ?French babies/toddlers in Surrey & bilingual book recommendations?.
?The best books I have found are the books by George Saunders, the Australian who raised his three children bilingually (English/german) though neither he nor his wife was a native speaker of German. They are, I think, out of print, but the first one at least is readily available second hand or via inter-library loans (mine cost about a fiver). Although he was a non-native, a lot of his advice seems sound and would hold good for more "conventional" bilingual families too.
?There's another one I got from Waterstones between Tottenham court road and Russell Square which was very useful and encouraging, but it's at home - I think it's called "The bilingual family - a handbook for parents" but will check tonight if you like.
?BTW the branch of Waterstones is significant - i tried the big one on TCR and they specifically directed me to the more "university" one near Russell Square tube. Or you could get it online, I suppose.
?If any of these books tickle your fancy and you actually want to know more about them, get in touch - happy to help.
?Incidentally, most of what the books tell you in practical terms can be picked up in 5 minutes and thereafter you just apply it as religiously as possible - the main benefit I found was in terms of moral support and hearing that what I was doing was NOT freakish, WOULD be good for mon petit piaf, and COULD be done if only I stuck at it.
?Bonne continuation!?
Hope this is of some help. Where are you based, btw?
S