A good place to start if you want to focus on a particular L1, is to look for corpora that match your required criteria (and then search for articles that cite them as references). Here's a list: http://www.uclouvain.be/en-cecl-lcworld.html
Also, Prof. Dr. Teresa Pica had done a lot of research in SLA, try the references for this article: http://www.sciencedirect.com/science/article/pii/0346251X9190024J
As far as books, books by Gass and Selinker or by R. Ellis are more introductory but tend to provide good references for each topic. A specialized book you can also consult: http://books.google.es/books?hl=es&lr=&id=YdDXAQAAQBAJ&oi=fnd&pg=PR1&dq=children+second+language+acquisition&ots=D8r15uCgbd&sig=qNd25b5snLuFIc6G-dwwhxb1ycA#v=onepage&q=children%20second%20language%20acquisition&f=false
I use to work with Tomasello (2003). Constructing a Language. A Usage based Thory of language acquisition. Mass: Harvard Univ. Press. And, if you read Spanish I suggest you an essential book if you analize language from a functional perspective Cecilia Rojas Nieto y Donna Jackson-Maldonado (eds.) (2011): "Interacción y uso lingüístico en el desarrollo de la lengua materna. México": Universidad Nacional Autónoma de México/Universidad Autónoma de Querétaro, 284 pp.a
Here is a short overview to get you started. There are references to some influential works. But understand that this is a whole field of study, with now over 60 years of formal scholarship, and several dedicated journals. BTW, the best available textbook is Eve Clark's, I think 2009 published by CUP (if memory serves). Good luck!
For my language acquisition classes, I use Stillwell Peccei (introductory) as well as Ambridge and Lieven (a bit more advanced). For some more references, see my articles and teaching materials on academia.edu, e.g. https://www.academia.edu/1220666/Syntax_and_Language_Acquisition (free for download, though you might have to register). We have also just started a blog on language games and some of the readings there focus on the use of language games in language acquisition research and efforts to support language acquisition: languagegamesforall.wordpress.com .