Books or tips for raising multi-lingual child?

Katie

So, my husband's native language is Russian, mine is English, but we both speak Spanish fluently (long story) and communicate between ourselves in Spanish (language of our home). I don't speak Russian and my husband's English is good, but not fluent. We want to raise our child as trilingual as possible. Does anyone have any good books or resources for doing that? We want him to speak all three languages as best as possible. Thanks in advance!